Lawn garden tractor battery. Best Lawn Mower and Tractor Batteries Types, Sizes, and Replacements

How To Choose The Best Lawn Tractor Battery

Lawn tractors make easy work of maintaining your lawn grass, but what happens when the battery no longer works? Similarly, there are times when a single charge no longer lasts for the whole operation. Instead of immediately buying a brand new lawn tractor, you should consider looking for a good battery replacement. Here, we take a look at the best lawn tractor battery to buy in 2021.

​What Is A Lawn Tractor Battery?

We all know that a lawn tractor is capable of many tasks that help improve the quality of your property with ease. Still, we must also be aware of its parts. In particular, we should know more about the lawn tractor battery.

​Size and Voltage

​For one, lawn tractors use various batteries that differ in voltages. You cannot just buy any random lawn tractor battery and expect it to work with the tractor you have. Lawn tractor batteries do come in different sizes. An overloaded lawn tractor due to a wrong battery isn’t desirable. Thankfully, you only need to either browse the user manual or search for the relevant information of the tractor model online.

​Use of Lead Acid

​Lawn tractor batteries utilize lead acid to function. Basically, the batteries need to follow a particular charge cycle in order for them to continue working properly in the long run. If you do not charge them for quite some time, the lead-acid contained in these batteries could crystallize. When this occurs, the charging capability is diminished. Thus, it’s wise to have a maintenance charger to keep the batteries charged even throughout winter.

​Here’s a video to help you know more about replacing a lawn tractor battery:

Maintenance and Use of Battery Water

Just like with any lawn care equipment, it’s important to practice proper maintenance of the battery. We’ll expound on this later on, but some general points include checking connections, cables, and terminals. They should be properly placed and cleaned to stop dust and other debris from affecting the batteries.

​Also, there are lawn tractor batteries that utilize battery water. These particular models need checking the battery water levels to ensure an optimal operation.

​When To Get A New Lawn Tractor Battery

Now that you know what a lawn tractor battery is, you must know when it’s the right time to get yourself a new one. The first sign is when the battery case begins to show cracks or have leakages. Second, you should get a new battery if the battery case has a bulge, which typically results from overheating.

​In addition, a battery with terminals that has damages and signs of extreme corrosion need to be replaced as soon as possible. A fourth reason is when the incorrect charger setting is used. Likewise, you should discontinue using the battery if it has a low electrolyte level. This occurs when air gets into the internal plates and it could lead to sulfation. Of course, an obvious reason to replace the battery is when the battery ceases to have a charge.

​How To Determine The Lawn Tractor Battery Size

If the information about the battery size isn’t readily available in the instruction manual or online, you can check it for yourself. In simple terms, the battery size can be identified through the measurement of volts and amps. Most lawn tractors need a 12-volt battery, but large models could need as many as 40 volts. Also, it’s important to be careful when handling the battery and to wash your hands afterward due to the sulfuric acid contained in it.

​First, you need to look at the upper section of the battery case. Search for the plastic caps. These can be actually unscrewed to give you a good view of the battery cells. Now, you must determine the total number of plastic caps. This total number should then be multiplied by two – the result is the battery voltage. To give an example, a battery with eight plastic caps has 16 volts. Furthermore, you should look at the battery case to get more information.

​A lot of lawn tractor batteries would have the voltage and the max current written there. The voltage would be simplified as “V” while the maximum current is shortened as “A” as it is also known as the amperage. If you still haven’t identified the size of the battery, you can take a picture of the battery. Just send this to the customer service of the battery manufacturer and they should provide you with the necessary information regarding battery replacement.

​Factors To Consider In Buying The Best Lawn Tractor Battery

Apart from knowing the battery size that is compatible with your lawn tractor, there are other factors that you need to be aware of before you get a replacement battery.

​Terminal Placement

​The positive terminal of a battery can be located either on the left side or the right side. You must know the terminal position required for your lawn tractor. The incorrect placement as you proceed to attach the cables could lead to damages both on the lawn tractor and on the replacement battery.


Some lawn tractor batteries have metal plates while others use lead plates exposed to sulfuric acid. Back then, the use of these lead plates didn’t get enough support due to their corrosion and loss of charge. With the application of calcium, however, these lead plates now have better tolerance for the aforementioned issues.

​CCA Rating

​CCA refers to the cold cranking ampere, which is something that lawn tractor batteries produce. Each battery has a CCA rating, which is identified through the measurement of the current created in 30 seconds when the temperature is at a mere zero degrees Fahrenheit. When the battery has a CCA rating, it means that it offers a good amount of battery and it will work well even under cold temperatures.

​Top 5 Best Lawn Tractor Battery Reviews

Husqvarna YTH2448 Lawn Tractor Battery

This lawn tractor battery weighs a total of 26 pounds with a dimension of 7.68 x 5.12 x 6.46 inches, which is pretty standard. It is considerably heavy, which is a good indicator of thick and sturdy plates. This does seem well-constructed overall, especially with the inclusion of a handle for easy carrying.

​One of the most notable features of this Husqvarna battery is the absorbed glass mat (AGM) technology. Combined with a lead-calcium alloy construction, the AGM technology could reduce the amount of maintenance required. Specifically, it is meant to prevent leaks and to eliminate the need to check for battery water levels.

​Installation of the battery was quick, and the company will likely contact you online in case you haven’t registered it for the 18-month warranty. In fact, they will offer to conduct the online registration themselves.

​Consequently, the Husqvarna YTH2448 Lawn Tractor Battery is designed to have a long battery life. This is made possible not only due to the fiberglass mat separators but also because of the high cell compression.

​In other words, this battery has good vibration resistance even under undesirable conditions. Apart from a warranty lasting 18 months, the Husqvarna YTH2448 Lawn Tractor Battery also comes with a 60-day money back guarantee.

What We Liked

  • AGM technology to effectively stop leaks and remove the need to check water levels
  • Quick installation and great customer service in terms of warranty registration
  • Sufficient vibration resistance during extreme conditions
  • Lead-calcium alloy construction for superb durability

Best Lawn Mower and Tractor Batteries. Types, Sizes, and Replacements

A lawn mower, tractor, and garden starting batteries are used for starting/cranking internal combustion engines and sometimes for powering other electric loads, including lights, smaller winches, various pumps, and similar devices.

When looking for a new battery, one must pay attention to several details in order to get the right battery that will serve well for years ahead.

Updated: October 27, 2022.

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Intro to Lawn Mower, Lawn Tractor, and Garden Starting Batteries

Riding lawn mowers, lawn tractors, power generators, and other tools and appliances are commonly powered by internal combustion engines, which use small rechargeable batteries for starting.

Most of such vehicles, tools, and appliances also feature a manual recoil starting system, but it is much more convenient to press the button or turn the key and start the engine. just like in cars.

The size of the internal combustion engines found in power generators, lawn mowers, and tractors vary from just 2-3 HPs to large 30-40 HP gas engines powering large riding lawn mowers.

And because of that, starting batteries used in such vehicles and devices vary from small batteries being able to provide a few dozen of CCA Amps to larger batteries being able to crank even a smaller car.

When looking for a lawn mower battery replacement, there are a few things to consider first:

Battery Voltage: Is a riding lawn mower battery a 12-volt battery?

Most riding lawn mowers use 12V batteries, but there are also some models, especially smaller ones, that use 6V batteries.

Since most manufacturers tend to move to 12V electric systems, in this article, we are going to discuss only 12V batteries.

Battery Chemistry Types

There are basically two types of batteries used as starting batteries. lithium and lead-acid batteries.

Lithium batteries, even Lithium Iron Phosphate (LiFePO4) batteries, are rather sensitive power sources that feature Battery Management Systems (BMS) that make their use much safer since BMS protects the battery from unwanted events like overcharge, over-discharge, over-current, short-circuit, over-temperature, etc.

Thanks to the built-in BMS, lithium batteries can be recharged using onboard alternators and often using older style lead-acid battery chargers (model dependent), but they should NOT be recharged using modern intelligent lead-acid battery chargers. such chargers can even damage the BMS system and void the lithium battery warranty.

Although lithium starting batteries are several times lighter than lead-acid batteries, weight savings for lawn mowers and tractors, and other similar vehicles and garden tools and appliances are not worth the price difference and potential complications. IMHO, of course.

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When compared with lithium batteries, lead-acid batteries are much heavier, have issues with capacity decrease when being discharged with strong currents, don’t support a large number of charging/discharging cycles, etc.

But, as starting batteries, lead-acid batteries are very reliable, robust, and very tolerant to charging conditions, and they are mostly cheaper than lithium batteries.

Lead-acid batteries differ in design and can be wet/flooded, enhanced wet/flooded, Absorbent Glass Mat (AGM), and Gel-Cell batteries.

Since AGM and Gel-Cell batteries are spill-proof and maintenance-free batteries, they are recommended models for lawn mowers, lawn tractors, power generators, etc.

Terminal Position and Type

Batteries come with different terminal types and with different terminal orientations.

When buying a new battery, be sure that the terminals and the orientation of the new battery match the terminal type and orientation of the old battery.

If they don’t, one may have issues connecting the new battery. If that happens, the workaround is to use cable extensions and terminal adapters.

However, the best thing to do is to get the battery with the same terminal type and orientation.

Fortunately, most starting batteries come with standardized terminals depending on their size/group.

Cold Cranking Amps (CCA)

CCA (Cold Cranking Amps) is the maximum current that a new, fully charged, 12V battery can deliver for 30 seconds, with the voltage NOT dropping below 7.2V, at 0°F (-18°C).

The new battery replacement for starting applications should have the same or better CCA rating in order to perform well.

Battery Capacity (Ah)

The capacity of lead-acid batteries is determined by how many amps of current can new, fully charged 12V battery at 80°F (~25°C), deliver for 20 hours without its voltage falling below 10.5V.

The capacity of starting/cranking batteries is often given for a period of 10 hours and not 20 hours. they are, after all, not designed nor intended for deep discharge applications.

Reserve Capacity (RC)

RC (Reserve Capacity) is the number of minutes that a new, fully charged battery (at 80°F, ~25°C) can deliver a 25A current and maintain a voltage above its cut-off value (10.5V for lead-acid batteries).

RC value is important for deep cycle batteries used in marine applications (for trolling motors, for example), RVs (in-house batteries), solar systems (off-the-grid applications), etc., and not so for riding lawn mowers, lawn tractors, and similar.

Of course, sometimes there are other things to consider when buying a new lawn mower battery, but these are the most important ones.

How to Charge Lawn Mower and Tractor Batteries

Lawn mower and tractor starting batteries are charged via an onboard alternator and charge controller, if present. Whenever the engine is turned On, the alternator recharges the battery and keeps it fully charged.

When the batteries are being charged separately, it is important to use a proper battery charger:

When wintering the lawn mowers and tractors with internal combustion engines, it is a good practice to recharge the battery fully and connect it to the battery maintainer during the storage period.

Lithium batteries generally have a much lower self-discharge rate than lead-acid batteries and can be left in the lawn mower and/or tractor for a longer period of time without recharging. as long as the parasite loads are minimum, preferably zero.

Most Common Lawn Mower Starting Battery Sizes

The following cross-reference chart lists some of the most popular lawn mower batteries with their most important features and specifications.

Note: Capacity, CCA, and weight are given for the lead-acid batteries.

As one can see, CCA values differ from 70-80 Amps for YTX5L-BS batteries to 400 Amps for YTX30L-BS AGM batteries, while lithium models often can provide 500 or even more starting Amps.

Best Group U1 U1R Battery Equivalents and Replacements

BCI Group U1 and U1R batteries are mostly general-purpose/deep cycle batteries, with only very few models being designed as dual-purpose and/or starting batteries.

Groups U1 and U1R batteries’ physical dimensions are (L x W x H) 7 3/4 x 5 3/16 x 7 5/16 inches (~197 x 132 x 186 mm) with the U1 battery having a positive terminal on the left side, and U1R having a positive terminal post on the right side of the battery (hence the ‘R’ as part of the label).

The average lead-acid U1/U1R battery’s 10-20h capacity is usually in the 33-37 Ah range, and the average weight is around 23-26 pounds.

As starting batteries, best U1/U1R batteries feature CCA ratings in the 300-320 range, while most of the batteries are able to provide at least 300 Amps for 3-5 seconds, with some models being able to provide 500 Amps for 3-5 seconds.

The following cross-reference chart lists the most popular U1/U1R batteries with their most important features and specifications.

Capacity (Ah)

Discharge Characteristics

Weight (lbs/kg)

Note: Amazon affiliate links (‘Model’ column) in the table open in the new Windows, feel free to check them for the most up-to-date offers and prices.

Best BCI Group U1 and U1R AGM batteries include:

VMAXTANKS V35-857 Battery

VMAXTANKS V35-857 battery, which features a CCA rating of 300 Amps and an RC value of 75 minutes at an acceptable weight of 25 pounds (~11.3 kg).

VMAXTANKS V35-857 battery is labeled as a deep-cycle battery, but it is an excellent all-around performer and is commonly used as a starting battery in lawn mowers and lawn tractors that use U1 batteries.

Also, it is often used as a kayak trolling battery, as a small off-the-grid battery, as a solar battery, as a backup/UPS battery, and similar.

The battery is able to withstand the following:

  • 3500 cycles at 10% DoD,
  • 1500 cycles at 25% DoD,
  • 900 cycles at 50% DoD,
  • 300 cycles at 100% DoD,

which is a very good result for a battery that is labeled as a deep-cycle battery, but it is actually a dual-purpose battery.

VMAXTANKS V35-857 battery is a spill-proof, maintenance-free battery that can operate in almost any position (except upside down), it accepts charge well and features a relatively low self-discharge rate (1-2% per month at room temperature).

Mighty Max ML-U1-CCAHR battery

Mighty Max ML-U1-CCAHR battery is a specially designed U1 lawn mower and tractor battery.

It is lighter than other U1 batteries, weighs only 14.57 pounds (~6.6 kg), and features a 10h capacity of only 18 Ah.

But, Mighty Max ML-U1-CCAHR also features a CCA rating of 320 Amps and is able to provide 20 Amps for 30 minutes down to 9.6 volts.

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When the battery is stored for a longer period of time, recommended charging point is @55-60% SoC, or when the voltage is around 12.35.

Note: the battery lifetime can be even prolonged if the stored battery is connected to the intelligent battery maintainer.

When the battery is stored @20°C, the average self-discharge rate is ~3% per month. recharge the stored battery every 3-6 months, and it will be fine.

For lawn mowers and tractors with a battery charging system requiring only starting/cranking U1 battery, Mighty Max ML-U1-CCAHR is perhaps the best choice.

Weize LFP1235 Deep Cycle AGM Battery

Weize LFP1235 is another excellent all-around performer, being able to provide 350 Amps for 5 seconds and 20.4 Amps for 60 minutes, down to 10.5 volts.

Also, it is one of the lighter AGM U1 batteries, weighing 23.2 pounds (~10.5 kg).

Weize LFP1235 (sometimes labeled as Weize TL1235) deep cycle battery is a spill-proof, maintenance-free, Sealed Lead Acid (SLA) battery that can operate in almost any position (except upside down), and it is vibration- and heat-resistant.

Thanks to the very balanced design, the Weize LFP1235 battery is one of the most popular U1 batteries, commonly used as lawn mower/tractor battery, wheelchair battery, in electric vehicles, for security systems, UPS battery, etc.

Mighty Max ML35-12 Deep Cycle AGM Battery

Mighty Max ML35-12 is one of the most, if not the most, popular U1 battery. it has excellent features, it comes at an affordable price, and it is one of the best-documented batteries of this size.

Mighty Max ML35-12 battery is a deep cycle AGM SLA battery, being able to provide 330 Amps for 5 seconds and 17.2 Amps for 60 minutes (down to 10.5 volts).

It accepts charge well. it features a max. charging current 10.5 Amps, which is excellent for a 37 Ah battery.

However, like all other batteries, when being recharged using AGM battery chargers, the charging current should be kept around 0.1C-0.15C.

Mighty Max ML35-12 battery also features a very low self-discharge rate. when the battery is stored @20°C, capacity drops:

As a general rule of thumb, lead-acid batteries should be recharged when their capacity drops down to 80%. Or, they should be connected to the advanced battery maintainer.

If You are looking for an all-around U1 battery, Mighty Max ML35-12 is one of the best choices.

Of course, other batteries in the chart are also commonly used in applications requiring U1 and U1R batteries and are tested by numerous users in real-life situations on a daily basis.

For the most up-to-date offers and prices, feel free to check the 12V 35Ah U1 Battery Amazon link (the link opens in the new window).

Best Group YTX30L-BS Battery Equivalents and Replacements

YTX30L-BS batteries feature physical dimensions of (L x W x H) 6.5625 x 4.9375 x 6.875 inches (166 x 126 x 175 mm) and are some of the largest Motorcycle/Powersports batteries, optimized for starting/cranking applications.

As such, YTX30L-BS batteries commonly have CCA ratings better than larger and heavier U1 and U1R batteries. on average, YTX30L-BS batteries feature a CCA rating of 280-385 Amps for lead-acid batteries and 480-720 Amps for lithium batteries.

The 10h capacity of the YTX30L-BS batteries varies around 28-30 Ah for lead-acid batteries, while the capacity of lithium batteries varies greatly and is usually in the 10-20 Ah range.

One of the very interesting features of YTX30L-BS batteries is that the negative battery terminal is set to the left, hence the ‘L’ as the part of the label. YTX30 L.BS battery.

The following cross-reference chart lists some of the most popular lead-acid and lithium YTX30L-BS batteries, with their most important features and specifications:

Note: Amazon links (Model column) open in the new Windows, feel free to check them for the most up-to-date offers and prices.

As one can see, there are several YTX30L-BS AGM batteries that feature a 10h capacity of 30Ah and a CCA rating of 385 Amps, with the most popular models being Chrome YTX30L-BS, Weize YTX30L-BS, Yuasa YIX30L-BS, etc.

Although AGM batteries are generally very good all-around performers and YTX30L-BS batteries can be used for powering various other loads, not just engine starters, they are designed for high-current applications, and they should be used as such.

Best Group YTX24HL-BS Battery Equivalents and Replacements

YTX24HL-BS batteries feature physical dimensions of (L x W x H) 8.0625 x 3.4375 x 6.375 inches (205 x 87 x 162 mm), 10h capacity of ~21 Ah, and CCA rating in the 260-350 Amps for AGM/Gel-Cell batteries and up to 420 Amps for the lithium batteries.

Despite having a 30-40% smaller capacity than YTX30L-BS batteries, YTX24HL-BS batteries feature CCA ratings that are very close to the CCA ratings of the YTX30L-BS batteries. YTX24HL-BS batteries are designed as ‘High Performance’ batteries, hence the ‘H’ as part of their labels. YTX24 H L-BS battery.

Also, YTX24HL-BS batteries feature a negative battery terminal to the left side of the battery, hence the ‘L’ as part of their label. YTX24H L.BS battery.

The following cross-reference chart lists some of the most popular YTX24HL-BS batteries with their most important features and specifications:

Note: Amazon links (Model column) open in the new Windows, feel free to check them for the most up-to-date offers and prices.

Lithium YTX24HL-BS batteries are not yet as popular as AGM/Gel-Cell batteries. they are used in high-performance motorcycles, snowmobiles, and similar vehicles where weight savings of 10-12 pounds can lead to improved performances, justifying the price difference and lower actual capacity.

Although YTX24HL-BS batteries are smaller than YTX30L-BS and especially U1 and U1R batteries, they can often crank/start surprisingly large engines.

For lawn mowers, lawn tractors, power generators, and other similar applications, AGM and Gel-Cell batteries are the most cost-effective batteries and the recommended ones.

Best Group YTX20L-BS and YTX20HL-BS Battery Equivalents and Replacements

YTX20L-BS and YTX20HL-BS batteries share the same physical dimension and terminal orientation (‘L’. negative to the LEFT side of the battery), but the YTX20HL-BS batteries are considered as ‘High-Performance’ versions of the ‘basic’ YTX20L-BS batteries.

Physical dimensions of these batteries are (L x W x H) 6.875 x 3.4375 x 6.125 inches (175 x 87 x 155 mm).

YTX20L-BS lead-acid batteries feature a 10h capacity of 14-19 Ah, a CCA rating of 220-270 Amps, and a weight of 12.5-15.0 pounds.

YTX20HL-BS lead-acid batteries feature a similar 10h capacity of 18-19 Ah and weight of 13-15 pounds, but the CCA rating is higher and is around ~310 Amps, allowing YTX20HL-BS to crank larger engines more easily.

Lithium YTX20L-BS/YTX20HL-BS batteries are not as common as lead-acid sealed batteries, but they offer a weight savings of around 10 pounds and are able to provide stronger currents, generally in the 350-500 Amps range.

The following cross-reference chart lists some of the most popular YTX20L-BS and YTX20HL-BS batteries with their most important features and specifications.

Note: Amazon links (Model column) open in the new Windows, feel free to check them for the most up-to-date offers and prices.

As one can see, many brands manufacture both YTX20L-BS and YTX20HL-BS batteries, despite very similar performances.

YTX20L-BS batteries are designed with reliability, robustness, and vibration resistance in mind and are, as such, perhaps a better choice for lawn mowers, lawn tractors, power generators, and similar vehicles and applications.

The most popular YTX20L batteries are:

Weize YTX20L-BS High-Performance Powersports AGM Battery

Weize YTX20L-BS is a very popular SLA AGM starting/cranking YTX20L- BS battery, featuring 10h capacity of 18Ah and 270 CCA.

The battery weighs ~12.6 pounds (~5.7 kg), it is a completely sealed, spill-proof, maintenance-free battery with increased resistance to mechanical impacts and vibrations, making it one of the best choices not only for motorcycles, ATVs, snowmobiles, and similar vehicles but also for lawn mowers and garden tractors.

When the battery is being charged outside the vehicle, recommended charging current is 1.8V (0.1C). the use of an advanced AGM battery charger with temperature compensation is highly recommended.

Yuasa YUAM320BS YTX20L-BS Battery

Yuasa YUAM320BS YTX20L-BS battery is another very popular YTX20L-BS battery featuring 18Ah (10h) capacity and 270A CCA current.

The battery is Valve Regulated Lead-Acid (VRLA), sealed AGM battery, designed to be robust and reliable and to endure vibrations and mechanical impacts. use it, but don’t abuse it!

When the battery is charged outside the vehicle, recommended charging current is 1.8A (0.1C).

The battery weighs 14.85 pounds (6.73 kg).

Note: battery is delivered dry and must be activated by the user.

On the other hand, YTX20HL-BS batteries are designed with performance in mind and are, as such, a better choice for high-performance motorcycles, ATVs, snowmobiles, and similar.

And thanks to the advanced AGM and Gel-Cell technologies, these batteries are also very reliable and vibration resistant.

Many manufacturers offer YTX20HL-BS batteries, but again, Weize and Yuasa stand out of the crowd thanks to very balanced designs.

Weize YTX20HL-BS High-Performance AGM Battery

Weize YTX20HL-BS High-Performance AGM Battery, also labeled as Weize TLM20-12, features a 10h capacity of 18Ah, and a CCA value of 310 Amps, which is an excellent result for a 12.85 lbs (5.82 kg) battery.

Because of the spill-proof, maintenance-free design, good resistance to vibrations, and mechanical impacts, the Weize YTX20HL-BS battery is one of the best buys and one of the most popular YTX20HL-BS batteries on the market.

When the battery is charged using a battery charger, recommended charging current is 0.1C (1.8A).

Weize YTX20HL-BS battery is intended for motorcycles, ATVs, snowmobiles, and other Powersports vehicles, making it a preferred model for lawn mowers and garden tractors as well.

Yuasa YUAM620BH YTX20HL-BS Battery

Yuasa YUAM620BH YTX20HL-BS Battery is another very popular high-performance YTX20HL-BS battery featuring 18V 10h capacity and 310 CCA Amps.

The battery is a VRLA AGM spill-proof and maintenance-free battery and can operate in all positions except upside-down.

The battery weighs 13.91 pounds (~6.3 kg). the battery is delivered in dry condition and must be activated when it arrives.

Note: some people prefer dry batteries that must be activated, while other users don’t want to do anything regarding battery acid.

Best Group YTX14-BS Battery Equivalents and Replacements

YTX14-BS batteries feature physical dimensions of 5.875 x 3.4375 x 5.75 inches (150 x 87 x 146 mm) and the same with less popular YTX14L-BS batteries (negative battery terminal to the Left).

YTX14-BS and YTX14L-BS lead-acid batteries feature a 10h capacity of 12-14 Ah and a CCA rating of 190-235 Amps.

YTX14-BS and YTX14L-BS lithium batteries are not as common as lead-acid batteries, but they ensure weight savings of some 7-8 pounds while having a CCA rating of 300-500 Amps.

Note: there are several battery dimensions that share a very similar label, but they differ in size, including YTX14AH-BS and YTX14AHL-BS batteries, which feature physical dimensions of (L x W x H) 5.25 x 3.5 x 6.5625 inches (134 x 89 x 166 mm), ~12Ah 10h capacity and 190-235 CCA rating.

The following cross-reference chart lists some of the most popular YTX14-BS batteries with their most important features and specifications:

Note: Amazon links (Model column) open in the new Windows, feel free to check them for the most up-to-date offers and prices.

Lithium YTX14-BS batteries are gaining in popularity, but AGM YTX14-BS batteries are still a much more popular type.

Manufacturers of lithium starting batteries, YTX14-BS size included, often label their batteries with the ‘lead-acid equivalent’ capacity, although their batteries have a much smaller actual capacity.

Although actual capacity is of lesser importance for starting batteries, parasite loads may discharge smaller capacity lithium batteries much faster than the larger lead-acid AGM and Gel-Cell batteries.

To prevent issues due to the parasite loads, some manufacturers include in their lithium batteries over-discharge protection with the Reset Button. when the parasite loads discharge the battery too low, BMS cuts off the battery from the vehicle. By pressing Reset Button, the user can activate the battery, which still has enough charge left to more or less safely crank the engine.

Note: Such system is NOT present in all lithium starting batteries, YTX14-BS batteries included.

Best Group YTX12-BS Battery Equivalents and Replacements

YTX12-BS batteries are very similar in size to YTX14-BS batteries. their physical dimensions are 5.875 x 3.5 x 5.125 inches (150 x 88 x 130 mm).

Lead-acid YTX12-BS batteries feature a 10h capacity of ~10 Ah, CCA rating in the 180-210 Amps range, and weigh 7-10 pounds.

Since YTX12-BS batteries are very popular Motorsport/Powersport batteries, many manufacturers also offer lithium YTX12-BS starting batteries which offer weight savings of 6-7 pounds, smaller capacity, but a better CCA rating of 250-500 Amps.

For high-performance and professional applications, lithium YTX12-BS batteries are highly recommended, but for residential riding lawn mowers and tractors, a good AGM or Gel-Cell YTX12-BS battery is the way to go.

The following cross-reference chart lists some of the most popular AGM, Gel-Cell, and Lithium YTX12-BS batteries with their most important features and specifications:

Note: Amazon links (Model column) open in the new Windows, feel free to check them for the most up-to-date offers and prices.

Although their capacity is relatively small, AGM and Gel-Cell YTX12-BS batteries are often used even in deep discharge applications, like small kayak trolling motor batteries for quick hops from one position to another, as a fish-finder battery, small inverter batteries, and similar.

Although starting AGM and Gel-Cell batteries are much more tolerant to deep discharges than wet/flooded starting batteries, they should not be used as such. a few cycles down to 50-80% DoD will not harm these batteries if they are soon after the discharge cycle recharged (preferably) using a Smart AGM/Gel-Cell battery charger.

Also, be aware that a semi-discharged lead-acid battery is unable to provide as strong starting current as a fully charged battery.

Best Group YTX9-BS Battery Equivalents and Replacements

YTX9-BS batteries feature physical dimensions of (L x W x H) 5.875 x 3.4375 x 4.125 inches (150 x 87 x 105 mm) and are used as starting batteries for small to medium-sized motorcycles, ATVs, riding lawn mowers, power generators, and other vehicles and appliances.

Lead-acid YTX9-BS batteries feature 10h capacity in the 6-10 Ah range and are able to provide 120-180 CCA Amps. Also, they weigh 6-9 pounds, depending on the model.

While wet/flooded lead-acid YTX9-BS batteries are being phased out in favor of AGM and Gel-Cell spill-proof maintenance-free batteries, lithium YTX9-BS batteries are becoming increasingly more present on the market.

Lithium YTX9-BS batteries’ typical weight is in the 2-3 pounds range, and they are able to provide 150-300 Amps for short periods of time, allowing them to easily crank/start gas and even diesel engines commonly found in small to medium motorcycles, ATVs and other Powersport vehicles and power generators.

The following cross-reference chart lists some of the most popular YTX9-BS batteries with their most important features and specifications:

Note: Amazon links (Model column) open in the new Windows, feel free to check them for the most up-to-date offers and prices.

For smaller lawn mowers that feature the electric start of their internal combustion engines, AGM and Gel-Cell YTX9-BS batteries are recommended models. they are reliable and durable batteries that come at rather an acceptable price.

Lithium YTX9-BS batteries may lead to some weight savings, and they can offer even stronger starting currents, but such advantages are not of great importance for lawn mowers.

Best Group YTX5L-BS Battery Equivalents and Replacements

YTX5L-BS batteries are some of the smallest cranking/starting batteries commonly found in smaller motorcycles, power generators, entry-level ATVs, smaller outboard marine motors, etc.

Their physical dimensions are (L x W x H) 4.4375 x 2.75 x 4.125 inches (113 x 70 x 105 mm), and they are most commonly lead-acid batteries, although ultralight lithium batteries are slowly appearing in this battery size, too.

Despite their compact size, YTX5L-BS batteries are able to provide 70-130 CCA Amps, although there are manufacturers that claim even more CCA Amps.

The typical weight of AGM and Gel-Cell YTX5L-BS batteries is 3.5-4.5 pounds, while lithium YTX5L-BS batteries weigh just 1.0-1.2 pounds.

The following cross-reference chart lists some of the most popular YTX5L-BS batteries with their most important features and specifications:

Note: Amazon links (Model column) open in the new Windows, feel free to check them for the most up-to-date offers and prices.

Lead-acid YTX5L-BS batteries are maintenance-free, spill-proof batteries that are very resistant to vibrations and mechanical impacts and can last a long time when protected from overcharging and summer heat.

When disconnected from the vehicle, AGM and Gel-Cell YTX5L-BS batteries should be charged with Smart battery chargers with dedicated AGM/Gel-Cell charging modes with charging current in the 0.5-1.0 Amps range.

Also, such battery chargers, after recharging the battery, automatically switch themselves into maintenance mode, keeping the battery fully charged over a longer period of time. highly recommended when wintering the vehicles and appliances that use YTX5L-BS batteries.

For the most up-to-date offers and prices, feel free to check the YTX5L-BS Battery Amazon link (the link opens in the new window).

Lawn Mower and Tractor Batteries Frequently Asked Questions (FAQ)

Here are some of the most common Frequently Asked Questions (FAQ) about lawn mower and tractor batteries and starting batteries in general.

What kind of battery do I need for my riding lawn mower?

Riding lawn mowers require small lead-acid or lithium starting batteries. exact battery size differs, so it must be checked for each lawn mower/tractor.

How long does a lawn tractor battery usually last?

A lawn tractor battery may last a few years, depending on the use and maintenance. if the lawn tractor is stored with the battery connected to the maintainer, such battery usually lasts a few years longer.

Is a riding lawn mower battery a 12-volt battery?

Most riding lawn mowers come with 12-volt electric systems, batteries included. But, just in case, check the Owner’s Guide of the lawn mower that You have.

How to charge a lawn tractor battery?

The lawn tractor battery is charged via an alternator connected to the lawn tractor engine. However, if the unit is not used periodically, it is a good practice to recharge the battery from time to time with a good battery charger and to store the lawn tractor with its battery connected to the battery maintainer.

Some smaller and older units don’t feature onboard battery chargers, requiring users periodically to recharge them using Smart battery chargers, usually in the 1-5 Amps range.

Such batteries should be recharged every 2-3 months or when cranking becomes difficult and slow.

Will a lawn mower battery start a car?

It depends on the size of the battery and the size of the car’s engine. Smaller lithium starting batteries will NOT start car engines since their BMS will disconnect the battery due to the too-strong current.

Smaller lead-acid batteries may even start a car engine, but that would be really too big load for smaller lead-acid batteries, shortening their lifetime.

Larger starting lead-acid batteries found in larger lawn mowers and tractors may start the car’s engine, although they are not intended for such use. it all depends on the battery size, its condition, CCA, and the size and type (gas, diesel) of the car’s engine, external temperature and similar.

Are tractor batteries the same as car batteries?

Tractor batteries and car batteries are of the same type and internal construction, but car batteries are generally larger.

P.S. yes, Yugo 45 is also considered a car, but its engine can be started with a larger lawn mower/tractor battery easily.

Can you use a car battery to charge a lawn mower battery?

If the fully charged car battery is connected to the discharged lawn mower battery (both batteries are of the same type/chemistry), some of the car’s battery charge will be transferred to the lawn mower battery.

However, initial charging currents can be rather large and may even damage the lawn mower battery.

If lawn mower/tractor battery charging is required, charge the lawn mower/tractor batteries using advanced battery chargers that monitor the battery condition and adjust the charging process according to the battery condition.

When should I replace my riding mower battery?

If the lawn mower/tractor features a battery charging system (alternator charge controller) and when:

  • the engine start becomes sluggish and slow,
  • the lights are dim,
  • the battery voltage is constantly around or below 12V with the engine Off,

it is time to replace the battery.

If the lawn mower/tractor doesn’t feature a charging system, take the battery out, recharge it completely and check how it performs. if it shows signs of a weak battery (slow and sluggish starts, dim lights, etc.), it is time to replace the battery.

Can you put a car battery in a lawn tractor?

Car batteries are generally too large for lawn tractors and cannot fit the lawn tractor’s battery compartment.

But, even if it is possible to put a car battery in a lawn tractor, don’t forget that too large battery can lead to alternator failure. whenever replacing the lawn tractor/mower battery, check the documentation that came with the unit and use replacement battery as recommended by the manufacturer.

Few Final Words

When looking for a new lawn mower replacement battery, be sure to match the old one regarding battery type/chemistry, size, terminal orientation, and terminal type.

Both the capacity and CCA rating of the new battery should be the same or better than the capacity and CCA rating of the old battery.

When wintering your lawn mower, check its Owner’s Guide regarding battery maintenance. if allowed by the lawn mower manufacturer, disconnect the battery (if there are no parasite loads, there is no need to disconnect the battery) and keep it charged using a Smart battery charger/maintainer.

During the summer heat, keep the lawn mower in the shade or preferably in the air-conditioned garage/storage room.

Note: internal combustion engines should be operated only in the open, not in garages, storage sheds, or similar, regardless of how good ventilation is. internal combustion engines produce colorless and tasteless Carbon Monoxide (CO), which is a very dangerous gas for humans and animals.

Also, these batteries often look like toys, but they pack quite a strong punch!

Whatever You do, stay safe!

Guaranteed Superior Performance

Because East Penn has built more than 250 quality control checks into the manufacturing process, Outdoorsman batteries guarantee superior performance – every time.

Lawn Garden Batteries:

Learn more about East Penn’s battery selection for lawn garden:

Deka Outdoorsman Batteries

The Outdoorsman battery delivers plenty of cranking amps to power tractors and small-engine recreational vehicles across the roughest terrain.

  • Electrical short prevention system protects power-producing components from life-robbing electrical shorts
  • Vibration-resistant design with reinforced posts, straps, and welds withstand demanding conditions
  • Power-Perform™, full-framed plates better withstand severe service demands while optimizing current transfer
  • Tough polypropylene case and cover resist external damage from tough outdoor use
  • Side, safety vent system prevents acid leaks up to a 45° tilt, keeping battery dry and corrosion-free

Additional Resources


With over 90 warehouses and distribution centers in North America, East Penn is here to service your delivery and core return needs through one powerful network.

Whether it’s store-door or direct delivery programs, our network of company-owned and operated facilities and premier sales and service staff delivers the industry’s leading logistical support and highest customer satisfaction levels.


East Penn is one of the only battery manufacturers to make all types of flooded, AGM (Absorbed Glass Mat), and Gel technologies. This gives customers a powerful choice and reliable information source for these lead-acid battery products.

We also offer the exclusive UltraBattery® and Synergy technologies for partial state-of-charge transportation applications. UltraBattery technology combines the advantages of an Advanced VRLA battery with the advantages of an asymmetric supercapacitor, while our Synergy battery technology offers one of the most cost-effective solutions that is ideal for Micro or Mild HEVs.

Resources Downloads

If you’re unable to find what you’re looking for, please feel free to contact us.



Why are East Penn’s Power-Perform Ⓡ Plates more efficient than other plates? The plate plays a critical role in the performance of the battery’s overall power system. The ability of the plate to store and deliver power is directly proportional to how well it supports the vehicle’s power needs. Power-Perform Plates perform these functions with the highest efficiency enabling more power-per-space and better overall performance. Full-frame structure provides better current transfer from all sides of the plate Enhanced crystallization of the active material and specially formulated oxide optimizes energy storage for high-powered performance Low resistance current path grids with more top frame intersecting wires allow the direct flow of energy for greater starting power Revolutionary paste adhesion techniques deliver better performance over extended use

How do East Penn’s Power-Perform Plates Ⓡ perform better while lasting longer? Power-Perform Plates work within an overall battery life protection system and an advanced durability design to extend performance and service life. Increased grid frame tensile strength resists plate growth to safeguard against life-threatening shorts Thicker backweb and puncture resistant separators prevent plate-to-plate electrical shorts Ultra-pure electrolyte with no impurities inhibits unnecessary water loss Full-frame plate structure prevents exposed wire electrical shorts Advanced battery formation controls prevent high temperature damage and under-formed, low-performance plates Precision craftsmanship, stringent testing, and consistent performance and quality analysis through advanced centralized laboratories ensure that Power-Perform Plates deliver optimized life, power, and durability, even under the most severe service. This means lower warranty claims due to less defects combined with better and longer battery performance.

AGM (Absorbed Glass Mat) TECHNOLOGY

What is AGM? AGM stands for Absorbed Glass Mat

What is an Absorbed Glass Mat? A highly absorbent, micro-porous mat made of special glass fibers. The specially designed mats are an essential component in the battery’s electrolyte suspension system. All of the electrolyte is absorbed into this material enabling a spillproof design.

Why buy an AGM battery from East Penn? East Penn is a pioneer in developing the Form, Fit, and Function of AGM battery technology. The company’s engineering design and manufacturing process meets major US and European OE automotive manufacturers’ standards. From the company’s use of the finest raw materials to precision-focused manufacturing (like the weighing and thickness analysis of every battery group), East Penn’s AGM battery design and process has been tested and proven to best meet the Form, Fit, and Function criteria of the automotive industry.

Are AGM batteries OK for any application? AGM batteries will replace a flooded battery in any typical alternator voltage regulated system. These systems generally maintain a voltage at 13.8 to 14.4 volts (cars, trucks, commercial trucks, boats, etc.). In fact, the efficient recharging of the AGM battery design can cause less wear on the vehicle’s alternator system over time.

Can AGM batteries be recycled like conventional flooded batteries? AGM and conventional flooded lead-acid batteries are one of the most recyclable products on the planet. Lead-acid batteries have a higher recycling rate than glass, aluminum, and newspaper. In fact, virtually 100% of every battery component can be recycled to make a brand new battery. East Penn operates one of the most modern and environmentally-safe facilities in the world. This enables our customers to assure their customers that they are recycling their batteries with someone they can trust.

Is AGM really a premium battery product? Yes. This advanced AGM technological design offers superior performance over conventional flooded batteries. All automotive batteries are expected to meet a certain level of performance standards for engine starting and to provide reserve power for the vehicle’s electronics. AGM batteries, however, are expected to excel in certain key aspects of battery use such as:


As the electrical, high heat, severe service, and durability demands continue to intensify for today’s vehicles, conventional flooded batteries may not deliver the dependable performance and service life needed under these conditions. This is not only the trend for cars and trucks, but now commercial trucks, marine vessels, and power sports vehicles are requiring a more evolved type of battery power.

CYCLING PERFORMANCE Why do customers need better cycling performance from their batteries? Today’s vehicles, and those to come, are being built with more factory-installed electronics and more places to plug in portable devices. For example, cars and other passenger vehicles have to provide power for items like LCD viewers, GPS systems, stereos and speakers, powered Windows or doors, cell and Smart phone charging, and anything else that plugs in or turns on. Boats need power for accessories like live-wells, GPS systems, stereos, hazard lighting, fish finders, and any other item that plugs in or turns on. Cars that utilize stop/start functions, like Micro Hybrid Electric Vehicles, demand extra durability and a better charge acceptance from their battery. As more types of electric vehicles evolve, so will the need for a higher cycling tolerance from the battery.

How do AGM batteries help to deliver better cycling performance? AGM battery technology withstands these additional accessory power and cycling demands while still having the power to start the vehicle. An AGM battery’s enhanced durability and charge acceptance makes it an essential component for many stop/start and other electrical system technology. Its ability to have over twice the cycle life of a conventional flooded design gives it a clear advantage for its implementation into progressing electric vehicle technology.

SEVERE SERVICE DURABILITY Why do customers need better severe service durability from their battery? Severe service and higher temperature conditions continue to escalate because there is less open space under-the-hood with more demand on the battery. Also, more vehicles undergo stop-and-start driving conditions, further increasing the need for enhanced durability.

How do AGM batteries help deliver better severe service durability? AGM battery technology can be utilized to help offset these increasing power and durability demands. The AGM battery’s ability to withstand severe service and accessory power demands under elevated temperatures and stop-and-go conditions will better safeguard performance and extend battery life.

DEEP DISCHARGE RESILIENCY Why do customers need a better deep discharge resiliency from their battery? Vehicles that aren’t used everyday have a higher risk of not starting because of parasitic accessory power loads. Parasitic loads, or even leaving something on when the ignition is off, can completely drain the battery’s power.

How do AGM batteries help deliver better deep discharge resiliency? AGM battery technology delivers a higher deep discharge abuse tolerance. This helps protect the battery longer from situations like infrequent use, parasitic power drains, or other deep power discharge (like leaving your vehicle’s lights on when the ignition is off).

VIBRATION RESISTANCE Why do customers need a battery that resists vibration damage? Vibration resistance is extremely important to protecting the battery’s life in almost any application that moves. Vibration or jolting movements can lead to electrical shorts or the loss of electrical storage capacity that can significantly decrease the battery’s performance.

How do AGM batteries help deliver battery vibration resistance? AGM technology utilizes an Absorbed Glass Mat that protects the battery’s internal components. These special separators serve as a shock absorber to the battery, which buffers vibration or other potentially damaging movement. This added vibration protection is especially ideal for off-road vehicles, watercraft, performance cars, tuner cars, or any other vehicles that undergo intense vibration during normal use.


What is Cycle Life? A CYCLE is a single occurrence when energy is taken out of the battery and then put back in. CYCLE LIFE is the ability of the battery to do that over and over again and continue to deliver reliable performance.

How does claims of extended CYCLE LIFE differ from claims of just extended battery life? LIFE vs. CYCLE LIFE Claims that a battery has extended LIFE could simply mean it survives longer than average in a typical automotive application in an average climate. In the real world, actual battery life is highly variable and unpredictable. The stresses on a battery differ by climate, vehicle differences, and user habits. A battery may last a long time under ideal conditions, but fail with only minimal abuse.

A battery with extended CYCLE LIFE survives longer than average under more grueling demands that portray a more realistic picture of real world use. This includes warmer climates, higher under-hood temperatures, longer than typical hours of usage, higher annual miles of operation, and frequent electrical loads while the engine is off.

Why do customers need better cycling performance from their batteries? Today’s vehicles, and those to come, are being built with more factory-installed electronics and more places to plug in portable devices. For example, cars and other passenger vehicles have to provide power for items like LCD viewers, GPS systems, stereos and speakers, powered Windows or doors, cell and Smart phone charging, and anything else that plugs in or turns on. Boats need power for accessories like live-wells, GPS systems, stereos, hazard lighting, fish finders, and any other item that plugs in or turns on.

Newer cars are also utilizing additional electronic functions in areas that were traditionally powered by the engine. This is not only the case for Hybrid Electic Vehicles, but is also being incorporated throughout a variety of standard automotive designs. These additional electronic services demand extra performance from the battery. As more types of vehicles evolve further into electrification, so will the need for the higher cycling tolerance and overall durability in a battery that can be found in the AGM design.

How does East Penn’s AGM product have extended CYCLE LIFE? East Penn’s AGM batteries have special glass mats that are strategically wrapped around the battery’s power producing components. The main reason for this mat is to absorb all the battery’s acid so the battery won’t leak or spill if turned over or if cracked. However, these mats also provide an added layer of protection for these components. This added protection enhances the battery’s durability against continual power drains like electronics. In fact, East Penn’s AGM batteries have 2x the cycle life over traditional maintenance-free flooded batteries to power more accessories for much longer. This enhanced durability also protects the battery from vibration, high temperatures, the rigors of stop-and-go driving and frequent vehicle use.


What are VRLA batteries? Valve-Regulated Lead-Acid or VRLA, including Gel and AGM (Absorbed Glass Mat) battery designs, can be substituted in virtually any flooded lead-acid battery application (in conjunction with well-regulated charging). Their unique features and benefits deliver an ideal solution for many applications where traditional flooded batteries would not deliver the best results. For almost three decades, East Penn has been manufacturing valve-regulated batteries using tried and true technology backed by more than 65 years experience. East Penn produces a complete line of Gel, AGM, and conventional flooded products for hundreds of applications. This diverse product offering enables East Penn to be objective as to the advantages of each type of battery. East Penn’s VRLA (Gel and AGM) products have the reputation of being the highest quality VRLA batteries available.

How do VRLA batteries work? A VRLA battery utilizes a one-way, pressure-relief valve system to achieve a “recombinant” technology. This means that the oxygen normally produced on the positive plate is absorbed by the negative plate. This suppresses the production of hydrogen at the negative plate. Water (H2O) is produced instead, retaining the moisture within the battery. It never needs watering, and should never be opened as this would expose the battery to excess oxygen from the air. In addition to damaging the battery, opening it also voids the warranty.

What is the difference between VRLA batteries and traditional flooded batteries? Flooded electrolyte batteries do not have special one-way, pressure-relief valves, as they do not work on the recombination principle. Instead, flooded designs utilize a vent to allow gas to escape. They contain liquid electrolyte that can spill and cause corrosion if tipped or punctured. They should not be used near sensitive electronic equipment. They can only be installed “upright.” Flooded batteries lose capacity and become permanently damaged if: Left in a discharged condition for any length of time (due to sulfation). This is especially true of designs that require water maintenance. Continually over-discharged (due to active material shedding). This is especially true of automotive starting types.

What are ideal applications for VRLA batteries?

Deep Cycle, Deep Discharge Applications Marine Trolling Electronics Sailboats Electric Vehicles Wheelchairs/Scooters Golf Cars Portable Power Floor Scrubbers Personnel Carriers Renewable Energy Village Power (Solar, Wind) Marine RV House Power Commercial Deep Cycle Applications

Standby and Emergency Backup Applications UPS (Uninterrupted Power Systems) Cable TV Emergency Lighting Computer Backup Renewable Energy Frequency Regulation (Solar, Wind) Telephone Switching

Other Applications Race or High Performance Cars On-Highway Trucking Off-Road Vehicles Wet Environments Marine RV Starting Diesel Starting Cars and Light Trucks Vehicles with with Accessories Start-Stop Systems

What are Gel and AGM batteries? VRLA technology encompasses both gelled electrolyte or gel batteries and absorbed glass mat or AGM batteries. Both types are regulated by special one-way, pressure-relief valves and have significant advantages over flooded lead-acid products.

AGM (Absorbed Glass Mat) batteries The electrolyte in AGM batteries is completely absorbed in separators consisting of matted glass fibers. This causes them to be spillproof, meaning they don’t leak acid like a flooded design if tipped on their side. The glass mats in AGM batteries are wrapped around the positive plate, which helps prevent damage from vibration and extend cycling. The battery’s groups are packed tightly in the case partitions also protecting its power producing components. AGM battery designs can have over twice the cycle life of a conventional flooded product in the right application.

Gel or Gelled Electrolyte batteries The electrolyte in a Gel battery is permanently locked in a highly viscous gelled state instead of the traditional liquid form. Because there is no liquid-type electrolyte, it will not leak out of the battery if tipped on its side. The thick, gelled electrolyte and tightly packed groups also protect the battery’s power producing components. Gel battery designs have a superior deep discharge resiliency and can deliver over two to three times the cycle life of an AGM product in the right applications.

What are some similarities between Gel and AGM batteries? Batteries utilize special one-way, pressure-relief valves and must never be opened. Requires no electrolyte maintenance unlike deep cycle flooded batteries that require frequent checking and adjustment of electrolyte levels. Uses a recombination reaction to prevent the escape of hydrogen and oxygen gases normally lost in a flooded lead-acid battery (particularly in deep cycle applications). Spillproof design enables installation in virtually any position (upside-down installation is not recommended). Has a higher tolerance against damage from deep discharge. These batteries have optimized amounts of electrolyte (which is also referred to as “acid-starved”) so that they use the power in the acid before they use the power in the plates. This minimizes the destructive nature of ultra-deep discharges. Ultra-deep discharging is what causes plate shedding, which can destroy a battery.

What are the Major differences between Gel and AGM battery performance? A Gel battery is better suited for super-deep discharge applications, which means it can withstand deeper discharges without damaging the battery’s performance. However, due to the physical properties of the gelled electrolyte, Gel battery power declines faster than an AGM battery as the temperature drops below 32ºF (0ºC). AGM batteries excel for high current, high power applications and in extremely cold environments. AGM batteries deliver a better dual purpose solution for a combination of starting and accessory power.

What are the advantages of GEL and AGM battery designs? (waiting on image)

What do I need to know about VRLA battery charging? All lead-acid batteries release hydrogen from the negative plate and oxygen from the positive plate during charging. VRLA batteries have one-way, pressure-relief valves. Without the ability to retain pressure within the cells, hydrogen and oxygen would be lost to the atmosphere, eventually drying out the electrolyte and separators.

Voltage is electrical pressure (energy per unit of charge). Charge (ampere-hours) is a quantity of electricity. Current (amperes) is electrical flow (charging speed). A battery can only store a certain quantity of electricity. The closer it gets to being fully charged, the slower it must be charged. Temperature also affects charging. If the right voltage is used for the temperature, a battery will accept charge at its ideal rate. If too much voltage is used, charge will be forced through the battery faster than it can be stored.

Reactions other than the charging reaction also occur to transport this current through the battery—mainly gassing. Hydrogen and oxygen may be given off faster than the recombination reaction. This raises the pressure until the one-way, pressure-relief valve opens. The gas lost cannot be replaced. Any VRLA battery will dry out and fail prematurely if it experiences excessive overcharging.

Note: It is too much voltage that initiates this problem, not too much charge — a battery can be “over-charged” (damaged by too much voltage) even though it is not fully “charged.” Never install any lead-acid battery in a sealed container or enclosure. Hydrogen gas must be allowed to escape.

Can continual undercharging harm a VRLA battery? In many respects, undercharging is as harmful as overcharging. Keeping a battery in an undercharged condition allows the positive grids to corrode and the plates to shed, dramatically shortening life. Also, an undercharged battery must work harder than a fully charged battery, which contributes to short life as well.

An undercharged battery has a greatly reduced capacity. It may easily be inadvertently over-discharged and eventually damaged.

Do VRLA batteries have a “memory” like Ni-Cad batteries? One of the major disadvantages of nickel-cadmium (Ni-cad) batteries is that after shallow discharge cycles, the unused portions of the electrodes “remember” the previous cycles and are unable to sustain the required discharge voltage beyond the depth of the previous cycles. The capacity is lost and can only be restored by slowly discharging completely (generally outside the application), and properly recharging. VRLA lead-acid batteries do not exhibit this capacity robbing effect known as memory.

What are the safety precautions for VRLA batteries? Although all valve-regulated batteries have the electrolyte immobilized within the cell, the electrical hazard associated with batteries still exists. Work performed on these batteries should be done with the tools and the protective equipment listed below. Valve-regulated battery installations should be supervised by personnel familiar with batteries and battery safety precautions.

Protective Equipment To assure safe battery handling, installation and maintenance, the following protection equipment should be used: Safety glasses or face shield (Consult application specific requirements) Acid-resistant gloves Protective aprons and safety shoes Proper lifting devices Properly insulated tools

Procedures Consult user manual of specific application for safety operating requirements. The following safety procedures should be followed during installation: (Always wear safety glasses or face shield.) 1. These batteries are sealed and contain no free flowing electrolyte. Under normal operating conditions, they do not present any acid danger. However, if the battery jar, case, or cover is damaged, acid could be present. Sulfuric acid is harmful to the skin and eyes. Flush affected area with water immediately and consult a physician if splashed in the eyes. Consult MSDS for additional precautions and first aid measures. 2. Prohibit smoking and open flames, and avoid arcing in the immediate vicinity of the battery. 3. Do not wear metallic objects, such as jewelry, while working on batteries. Do not store un-insulated tools in s or tool belt while working in vicinity of battery. 4. Keep the top of the battery dry and clear of all tools and other foreign objects. 5. Provide adequate ventilation as regulated by Federal, State and Local codes and follow recommended charging voltages. 6. Extinguishing media: Class ABC extinguisher. Note: CO2 may be used but not directly on the cells due to thermal shock and potential cracking of cases. 7. Never remove or tamper with pressure-relief valves. Warranty void if vent valve is removed.

Can VRLA batteries be installed in sealed battery boxes? NO! Never install any type of battery in a completely sealed container. Although most of the normal gasses (oxygen and hydrogen) produced in a VRLA battery will be recombined and not escape, oxygen and hydrogen will escape from the battery in an overcharge condition (as is typical of any type battery).

These potentially explosive gasses must be allowed to vent to the atmosphere and must never be trapped in a sealed battery box or tightly enclosed space!

Does depth of discharge affect cycle life? Yes! The harder any battery has to work, the sooner it will fail.

The shallower the average discharge, the longer the life. It’s important to size a battery system to deliver at least twice the energy required, to assure shallow discharges.

Follow these tips for the longest life: Avoid ultra-deep discharges. The definition of ultra-deep discharge may vary with application and battery type. Don’t leave a battery at a low stage of charge for an extended length of time. Charge a discharged battery as soon as possible. Don’t cycle a battery at a low state of charge without regularly recharging fully. Use the highest initial charging current available (up to 30% of the 20-hour capacity per hour) while staying within the proper temperature-compensated voltage range.

What is a thermal runaway? The appropriate charge voltage depends on the battery temperatures. A warmer battery requires a reduced voltage. If the voltage is not reduced, current accepted by the battery increases. When the current increases, the internal heating increases. This can rise to destructive levels if not taken into consideration.

Thermal runaway can be prevented with: Temperature compensation monitoring at the battery —not at the charger. Limiting charging currents to appropriate levels. Allowing for adequate air circulation around the batteries. Using timers or ampere-hour counters. Using Smart chargers that recognize the signature of a thermal runaway event which will shut the charger down.

Lawn Mower Battery Size Chart | A Comprehensive Guide On Lawn Mower Batteries

Mowing is a fancy word for cutting grass. As a part of maintaining the lawn, many of us spend the maximum time mowing the lawn. The purpose of mowing is to keep the grass in the lawn at a set height so that the lawn looks neat and attractive. Lawn Mowers, as the name suggests, are a piece of special equipment that helps us in mowing lawns. Today, we have cordless and electric type lawn mowers that mow using an electric motor. But if you need a heavy-duty lawn mower, then chances are you look at a gas-powered lawn mower. Earlier gas-powered lawn mowers use a pull-string to start the engine. But nowadays, you get simple electric start models. The problem with electric start lawn mowers is they need starting batteries and depending on your usage, they die and you have to replace them.

There are several important parameters and specifications that you need to be aware of while choosing a replacement. So, in this guide, we decided to make a beginner’s guide on Lawn Mower Batteries. First, we will all the essential things about lawn mower batteries and then we will move to the lawn mower battery size chart.

Using this chart, you can compare your battery with the specifications of other batteries and purchase a perfect replacement.

A Brief Note on Lawn Mowers

We have been using lawnmowers since the late 1800s. All the initial lawnmowers were completely mechanical devices. Very soon, we saw gasoline-engine-based lawnmowers that made the job of lowing a garden very fast and easy.

These types of mowers are very popular even today as they are very powerful and allow you to mow thick and tall grass very easily. Then we have the main electric-powered lawn mowers.

They are small and easy to maneuver in small to medium-sized gardens. As a result, they became very popular in the market. But the limitation is you need to drag the cable or you can reach as far as the cable allows you.

The next important type is also electric but this time it is in the form of battery-powered mowers. These are cordless devices and you can use them anywhere you want. Their ridiculous cost makes them a niche product.

Types of Lawn Mowers

The basic type of lawn mower is a Reel Mower. It is a mechanical device that runs on our muscle power. We have to push the mower and when the wheels rotate, blades mounted on a cylinder cut the grass with a scissor-like action.

Next, we have rotary mowers that are powered by electricity, a battery, or a gas engine. Of the three power sources, gas-powered rotary lawn mowers are very common and popular, especially in the North American market.

You get both push-type as well as self-propelled models in gas-powered mowers. These types of mowers are very useful for large gardens, usually up to half an acre.

If you have a relatively small lawn, then corded electric lawn mowers are ideal. They are silent (comparatively), do not pollute, and are easy to maintain. Maneuverability is the main concern with corded-electric lawn mowers. In most cases, you have to stay within 150 to 200 feet distance from an electrical outlet.

An alternative to this is battery-powered cordless electric lawn mowers. They are very easy to maneuver as you don’t have to worry about the electric cord. Cordless Lawn Mowers are heavier than their corded counterparts.

Depending on the size of the battery, these models allow you to mow continuously anywhere between 45 minutes to 2 hours. But the cost of cordless lawnmowers is very high.

All the models we discussed till now are push-type or walk-behind mowers. But there is another type in the form of ride-on or riding mowers. As the name suggests, you can sit on the mower and ride it across the lawn to mow the grass.

If you have a very large lawn, over half an acre, then it makes sense to invest in a riding lawn mower. Usually, the ride-on mowers are gas-powered with rotary-type cutting mechanisms.

You often hear the term lawn tractor when you browse for riding lawnmowers. While ride-on lawn mowers just mow the lawn, riding lawn tractors can mow the grass and much more.

With the correct attachment, you can use a lawn tractor for mowing, dethatching, aerating, fertilizing, and even plowing snow.

Understanding Lawn Mower Batteries

As we mentioned in the previous section, gas-powered lawn mowers are very popular, be it the walk-behind type or the ride-on type. Earlier models came with a pull-string to start the gasoline engine.

Depending on the age of the mower, you could start the engine with a single pull in case of a relatively new and well-maintained mower. But as it ages, the performance of this starting mechanism starts to fail and you might need to pull more than a couple of times to crank the engine.

This is where lawn mowers with starter batteries come in handy. These batteries work similarly to our car SLI batteries as they help crank the gasoline engine of the mower.

With the push of a button or twist of a key, you can start the lawn mower and don’t have to worry about any pull strings.

Comparison between Lawn Mower Batteries and Car Batteries

The moment we say lawn mower batteries are useful for easily starting the mower’s engine, we immediately start comparing them with car starter batteries. They are similar in some aspects but there are a lot of differences as well.

Let us begin with the similarities. Car batteries are usually flooded lead-acid type or sometimes maintenance-free gel-type. It is very rare to see other types of batteries as car starter batteries.

Even lawn mower batteries are lead-acid batteries and they come in both flooded as well as gel types. But surprisingly, you can also find lithium batteries for lawn mowers.

As the majority of batteries in both cases are of type lead-acid, their working remains more or less the same. The advantages and problems you have with car batteries, you also have them with lawn mower batteries.

This includes low cost, a simple charging system, the life of the battery, etc.

Does this mean can we use a car battery in a lawn mower? No. this is where the differences kick in. First thing, car batteries are much bigger than lawn mower batteries, both in terms of physical dimensions as well as capacity.

The main difference is the starting current they can provide, which we usually represent as Cold Cranking Amps or CCA. As car engines are quite large, their batteries must provide a lot of amps to crank the engine.

So, you usually see CCA ratings of 500A or more in car batteries. But lawn mower engines are small. You don’t need such large currents. That’s why you will see CCA ratings in mower batteries in the range of 130 to 150A.

Important Specifications of Lawn Mower Batteries

Continuing the previous section’s discussion, let us see some important parameters and specifications of typical lawn mower batteries.

Type of Battery

As we mentioned before, you can find both lead-acid and lithium batteries for lawn mowers. In the case of lead-acid type, you again have flooded, AGM (Absorbent Glass Mat), and Gel types. Each type has its advantages and disadvantages.

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Lithium batteries or Lithium Iron Phosphate to be specific, are also becoming quite popular with lawnmowers. The charging and protection methods (or lack thereof) are very different between lead-acid and lithium batteries.

Lead acid batteries are affordable, heavy, and robust to operate in all climatic conditions. But the problem is you have to take care of them and make sure they are fully charged all the time. Speaking of charging, the number of times you can charge and discharge a lead-acid battery is very less.

Lithium Batteries on the other hand are expensive and lightweight. Even though they support a good number of charge/discharge cycles, they need special circuitry in the form of a Battery Management System or BMS to protect the individual lithium cells from overcharging, deep discharging, etc.

Charging lead-acid and lithium batteries is very different. You can get chargers that support both these battery types but double-check the capabilities of the charger before using. Do not blindly use one type of charger on the other type of battery.

If the lawn mower has an alternator (which is usually the case with riding-type lawn mowers and lawn tractors), it can charge the battery once the engine is on. But for smaller mowers, this is usually not the case. You have to charge the battery externally.

Size and Other Physical Parameters

Physically, lawn mower batteries are smaller. In the next section Lawn Mower Battery Size Chart, we will see the dimensions of some popular types of lawn mower batteries.

Another important “physical” aspect of lawn mower batteries is the terminals and their position. Unlike car batteries, which usually have a pretty standard type of terminals, mower batteries have more than one type of terminal to connect the cables.

Also, the position of the terminals might be different between brands, manufacturers, and battery types. Usually, in a particular battery group, the type of terminals and their position (which is almost always on the top) will be common.

But we cannot say the same when you go to a different battery group.


The reason why we are talking about battery voltage is in the early days of lawn mower batteries, we used to get them in 6V ratings as well. But it is safe to assume that most modern mower batteries that we get today are 12V batteries.

This applies to both lead-acid and lithium batteries. So, all the batteries we are going to discuss in the guide are 12V unless otherwise mentioned.


The capacity of a starter battery is an interesting specification. It represents the amount of current in amps a fully-charged battery can deliver for 10 hours straight.

We usually see the battery capacity specification as Ampere Hour or Ah. Depending on the size of the battery, its capacity can range anywhere between 10Ah to 40Ah.

Cold Crank Amps (CCA)

This is one of the important specifications of a starter battery, be it for cars or lawn mowers. What does CCA mean? Cold Crank Amps or CCA represents the amount of cranking current (in amps) a fully-charged battery can deliver for a period of 30 seconds at a temperature of 0°F.

As the size of the gas engine in mowers is small, you don’t need a large cranking current to start the engine. Hence, you will see CCA ratings of mower batteries in the range of 100A to 300A. You can find batteries with CCA ratings more or less than this range. You have to check your lawn mower’s manual as it will usually recommend a specific CCA value.

Lawn Mower Battery Size Chart

An important thing to remember before purchasing a new mower battery is they are significantly smaller than car batteries and within lawn mower batteries we have several sizes.

A Battery Group categorizes the physical dimensions of the battery. All the batteries falling in a particular group have nearly identical shapes and sizes. If you are familiar with car and boat batteries, there are we have several battery groups.

Let us now see some popular lawn mower battery groups. The groups in this list are no way near the full possible types but these are pretty common with mowers.

The following table is a Lawn Mower Battery Size Chart consisting of the common battery groups.

Different manufacturers have their own set of battery sizes and they may or may not be compatible with batteries from other manufacturers. But if they come under the same battery group, then chances are they will become compatible.

How To Choose a Replacement Lawn Mower Battery?

The common thing between a gas-powered lawn mower and a car is they both have engines. But we take cars very frequently to school, work, shopping, or other commuting activities.

This is not the case with lawn mowers. We use them only when we need to mow the lawn or garden. So, for the most part of its life, a lawn mower usually sits in a garage or shed.

Here comes the problem. As we take our cars out for a spin on a regular basis, the level of discharge of the car’s starter battery won’t be that bad. But as lawn mowers are sitting idle most of the time, there is a good chance that the battery will discharge pretty quickly.

If you have an external charger, then you can extend the life of the lawn mower battery. But in case you don’t have a battery charger, then you will at a replacement in a short time.

Things to Consider for Lawn Mower Battery Replacement

The first and most important thing while choosing a new lawn mower battery is to check the physical dimensions of the battery. Lawn Mowers have a slot for the battery that fits only one type of battery.

When we say one type, we mean one size. The replacement battery must fit perfectly into that slot and it should be loose (and if it is tight, you can’t even fit the battery into the slot).

So, check the owner’s manual or maintenance guide of your lawn mower and look for battery specifications. If they mention the battery group, then you can simply browse for that particular group and purchase a replacement.

What if you can’t find the battery group information? We have to old school and measure the dimensions of your current battery. With this information, you can look up any lawn mower battery size chart and compare the dimensions with the common and popular battery groups in the list.

After the battery group size, the next important specification is the CCA rating of the battery. Once again, check the user manual if they specify the necessary CCA of the battery. If not, look at the label of the current battery and you might find the CCA ratings.

When shopping, you need to match the CCA values. It can be higher than the current value, but never lower. But if you opt for a higher CCA rating, then you have to spend more money.

Another important thing is the type of battery. We have lead acid and Lithium Iron Phosphate as the two base battery types. Further, in lead-acid, we have wet or flooded, AGM, and Gel types.

Always choose a replacement battery of the same type as your current battery. The compatibility between different battery types is, to put it in simple terms, highly questionable.


If you have a lawn or garden, then you have to invest in a decent lawn mower. It does the job of shearing or cutting the grass and maintaining it at a set level very easily.

Like many power tools, even lawnmowers come in different shapes, sizes, and power options. The most common and popular one is the gasoline engine-powered lawn mower.

Pull-starting the gas engine of the lawn mower is an old technique. Nowadays, most lawn mowers come with electric starters. When we say electric starters, it means there is a battery involved in it.

If the battery is old or dead beyond recharging capabilities, then you have to look for a replacement.

In this guide, we saw the basics of lawnmowers and their types. Then we moved to different types of lawn mower batteries and also some important specifications you need to consider while looking at mower batteries.

After that, we made a simple lawn mower battery size chart. This chart consists of some popular lawn mower battery groups with their physical dimensions.

We hope that this guide on lawn mower battery size chart could help you understand the basics of lawn mower batteries and also in making an easy purchase decision.

If you feel we missed something or want us to add anything, do let us know in the Комментарии и мнения владельцев section below. If you want, we can add lists of possible replacements in several battery groups (for instance, all the best replacement batteries for the U1 or U1R battery group).