DIY battery for electric screwdriver 12

Electric screwdriver battery: design and types

It should be noted that regardless of the brand of the electric screwdriver and the country of the manufacturer, the batteries have an identical structure. The assembled battery pack looks like this.

If we analyze it, we will see that it is assembled from small elements that are assembled sequentially. And from the school physics course, we know that elements that have a serial connection harmonize their potentials.

Note. The sum of each battery gives us the total voltage at the contacts of the battery.

Typesetting parts or “cans”, as a rule, have a standard size and voltage, they differ only in capacity. Battery capacity is measured in Ah and is indicated on the cell (pictured below).

For the arrangement of screwdriver batteries, the following types of elements are used:

  • nickel. cadmium (Ni. Cd) batteries, with a nominal voltage on the “banks” of 1.2V;
  • nickel-metal hydride (Ni-MH), voltage across elements. 1.2V;
  • lithium-ion (Li-Ion), with voltage. 3.6V.

Let’s consider in more detail the advantages and disadvantages of each type.

  • The most common type due to its low cost;
  • Low temperatures, such as Li-Ion batteries, are not scary;
  • Stored in a discharged state, while retaining its characteristics.
  • Produced only in third world countries, due to toxicity during production;
  • Memory effect;
  • Self-discharge;
  • Small capacity;
  • A small number of charge / discharge cycles, which means they do not “live” for a long time with intensive use.
  • Environmentally friendly production, there is an opportunity to purchase a high-quality branded battery;
  • Low memory effect;
  • Low self-discharge;
  • High capacity compared to Ni. Cd;
  • charge / discharge cycles.
  • Price;
  • Loses some of its characteristics during long-term storage in a discharged state;
  • Does not “live” for a long time at low temperatures.
  • No memory effect;
  • Self-discharge is almost absent;
  • High battery capacity;
  • The number of charge / discharge cycles is several times greater than that of previous types of batteries;
  • To set the required voltage, fewer “cans” are required, which significantly reduces the weight and dimensions of the battery.
  • High price, almost 3 times in comparison with nickel. cadmium;
  • After three years, there is a significant loss of capacity, because Li decomposes.

We got acquainted with the elements, let’s move on to the rest of the elements of the battery pack of the electric screwdriver. Disassembling the unit, for example, for repairing the battery of a Hitachi electric screwdriver (pictured below), is very simple. we unscrew the screws around the perimeter and disconnect the case.

  • Two power, “” and “-“. for charge / discharge;
  • Upper control, it is switched on through a thermal sensor (thermistor). A thermistor is necessary to protect batteries, it cuts off or limits the charge current when a certain temperature of the cells is exceeded (usually in the range of 50. 600C). Heating occurs due to high currents during forced charging, the so-called “fast” charging;
  • The so-called “service” contact, which is connected through a 9K ohm resistance. It is used for complex charging stations that equalize the charge on all battery cells. In everyday life, such stations are useless, due to their high cost.

That’s actually the whole design of the battery. Below is a video on how to disassemble a block.

Is it possible to “reanimate” the elements and how?

Let’s proceed to part 3 of repairing an electric screwdriver battery and immediately make a reservation that the concept of “resuscitation” for lithium. ion batteries is not applicable. There is no memory effect in them, most likely, lithium decomposition has occurred, and nothing can be done about it. In such batteries, it is necessary to find out what the cause of the malfunction is: the element itself or the control circuit. There are two options here:

  • we change the control scheme from another, but similar to ours, battery, if it helps, we find a replacement and change it;
  • apply 4V to a cell with a current of about 200mA, this requires an adjustable charger. If the voltage on the element rises to 3.6V. the element is working properly, the problem is in other elements, or in the control circuit.

Electric screwdriver battery refurbishment is mainly available for Ni-Cd batteries, but they are usually the most common in household screwdrivers.

So how to reanimate an electric screwdriver battery? There are two types of “resuscitation” for these types of batteries:

  • The method of compaction or compression (it will work in cases where the electrolyte is still present, but the volume is lost);
  • “Firmware” voltage and current greater than the nominal. This method allows you to eliminate the memory effect, and although not completely, but restore the lost capacity.

Note. As a rule, in a nickel. cadmium battery, the main reason for the loss of capacity is the boiling off of the electrolyte, and if it is critically small, no “firmware” will help.

This method, if its result is positive, will not solve the problem of failure of elements. Rather, it will only postpone the replacement of those that have become unusable and in the future you will still need to repair the battery of the Makita electric screwdriver or any other.

12V cordless drill battery cell changing


In this article, which we will conditionally divide into three parts, we will consider: the types of batteries that are used in screwdrivers (part 1), their possible causes of failure (part 2) and available repair methods (part 3).

Fault definition

We figured out the purpose of the elements of the battery structure, now we will consider how to determine the malfunction, this is part 2 of repairing the battery of an electric screwdriver. Immediately, we note that all the elements cannot fail at once, and since our circuit is sequential, when one element fails, the whole circuit does not work. So, our task is to determine where we have the weakest link in the chain.

For this, we will need a multimeter, and for the second method of troubleshooting a 12V lamp, if your battery for an electric screwdriver is also 12 volt. The procedure is as follows:

Note. The difference between the cells in the battery of 0.5. 0.7V is considered significant, this means that the cell becomes unusable.

Thus, we have found candidates for “resuscitation” or “amputation” and replacement with new elements.

If your electric screwdriver operates on 12 or 13 volts, you can search using a simpler method. We disassemble the fully charged battery and connect a 12 volt lamp to the contacts “” and “-“. The lamp will be a load and will drain the battery. Next, we take measurements on the battery cells, where the voltage drop is strongest, there is also a weak link.

There are other ways, instead of a lamp, you can choose a resistance, but for this you already need the basics of electrical engineering, and it is doubtful that a resistor with the necessary resistance would be at hand.

Other faults are very rare. For example, loss of contact at the soldering points of the batteries or power contacts of the unit, failure of the thermistor. This problem is more inherent in fakes. Due to the rarity, we will not focus on the battery elements.

With the “problem” elements sorted out, it is necessary to repair. How to repair the battery of an electric screwdriver? In general, there are 2 ways available for repair, so to speak. This is the restoration and replacement of elements that have become unusable.

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Repair and replacement of battery elements for an electric screwdriver

A more effective way to repair batteries for an electric screwdriver is to replace elements that we have identified as faulty.

Note. When purchasing a new element, make sure that its capacity and dimensions coincide with the native elements.

We also need a soldering iron, a low-corrosion flux (preferably an alcohol flux for rosin) and tin. We are not talking about spot welding, since there is hardly a need to purchase or assemble it for a one-time battery repair

In the replacement itself, there is nothing complicated, especially if at least some. then there is experience in soldering. The photographs show everything in sufficient detail, we cut off the faulty element, instead of it we solder a new one.

  • when soldering with a soldering iron, try to solder quickly, so that the battery does not heat up, because risk spoiling it;
  • if possible, implement the connection using native plates, or use the same copper plates, this is important because the charging currents are large and if the cross-section of the connecting wires is incorrect, they will heat up, respectively, the thermistor protection will be triggered;
  • in any case, do not confuse the plus of the battery with the minus. the connection is sequential, which means that the minus of the previous can goes to the plus of the new can, and the minus of the new one. plus the next.

After the new elements have been soldered, it is necessary to equalize the potentials on the “banks”, since they are different. We carry out a charge / discharge cycle: we set it to charge overnight, give it a day to cool down and measure the voltage on the elements. If we did everything correctly, the picture will be something like this: on all elements the same indicator of the multimeter, within 1.3V.

battery, electric, screwdriver

Next, we proceed to discharge the battery, insert the battery into an electric screwdriver and load it “to the full.” The main thing is to spare the electric screwdriver itself, otherwise you will have to repair it too. We bring it to full discharge. We repeat this procedure two more times, i.e. charge and fully discharge.

It should be noted that the procedure for erasing the “memory effect” should be carried out every three months. It is carried out by analogy with the above-described training.

Such a not very tricky procedure will prolong the operation of your electric screwdriver, at least until you have to replace it with a new one.

Do-it-yourself actions when replacing the power supply for a 12v and 18v electric screwdriver

You can find a suitable power source on the market or from someone you know. When choosing, they pay attention to its reliability, lightness, dimensions. Suitable for this:

  • battery powered by a laptop or other special equipment;
  • charger for car batteries;
  • PSU from an old computer;
  • homemade power supply.

First you need to check its performance, and then disassemble. The body, twisted with screws, is easy to dismantle. The glued body is disassembled by tapping on the seam with a hammer. In this case, a thin knife may be needed. It is placed with the sharp side on the scar and gently knocked on it with a heavy object.

The next step is to separate the cords and leads from the plug. The easiest way to do this is with an electric soldering iron. Where the insides of the device for unscrewing and tightening screws were hidden, they place the insides from a new battery. The wire for operation from the mains is led out through the hole and soldered to the power supply, subject to the polarity rules. The wires are insulated. Then the body is assembled, and the converted tool is checked in practice.

After the alteration, the characteristics of the device have changed. Mains operation does not provide instant maximum torque. Due to the fact that the power of the device increases, the screw gun heats up faster. Therefore, when working with this tool, you should take breaks every 15-20 minutes. Also, do not forget about high-quality insulation and grounding. Thanks to your actions, you got a tool that works properly from a battery and from electricity (in the case of a laptop) or only from electricity.

Alternative to power supplies for 12v and 18v electric screwdrivers. DIY replacement

The screw gun is considered an indispensable device for specialists who work with it constantly and for an amateur who performs certain types of work. This tool has become the best alternative for the screwdriver, which is very slow to cope with its duties. With an electric screwdriver: “Zip, zip. and you’re done!”

However, over time, the cheerfully cheers of the instrument diminish and it performs worse than before. Charging shows that everything is in order, but the work slows down, worsens. This indicates that the power supply is worn out. It can be replaced by purchasing a new one. But this is the easiest and most expensive option. We choose a different path! Let’s try to swap our industrial battery for another power supply.

READ: How to choose a screwdriver according to the parameters and be satisfied with the purchase


Replacing the power supply for a 12v and 18v electric screwdriver with your own hands will save you money and bring satisfaction from the result obtained. However, it is not always possible to use this tool without an electrical outlet. In all other respects, only positive aspects.

The design of the device for loosening and tightening screws

Before starting the alteration, you need to familiarize yourself with the design of the screwdriver. It consists of:

  • hulls;
  • a storage battery with a supply voltage range for tool brands from 12 to 18 volts;
  • DC motor;
  • start buttons;
  • regulator of efforts;
  • rotation speed regulator with reverse;
  • planetary or conventional gearbox;
  • directional change levers.

Photo 1 shows the construction of the screwdriver.

Preparation process

Let’s try to make power supplies for a 12v and 18v electric screwdriver with our own hands. Before starting work, you need to familiarize yourself with those power and supply voltage indicators that are presented in the original documentation or on the case. Then you need to decide on the use of a suitable AC adapter in size. In the old device, you need to take out all the contents, measure the dimensions of the inside.

Instead of paying a lot of money to replace the battery for a screwdriver, you can get by with replacing the power supply unit from used devices. Almost every male amateur can handle this task. So, dear masters, look for a profitable option!

Do-it-yourself 12V power supply for an electric screwdriver: manufacturing instructions, diagram

Can a master do in construction without such an indispensable tool as an electric screwdriver? It will not be possible to carry out a full-fledged work without using such a tool, because you constantly need to tweak or strengthen something somewhere. Such a need for an electric screwdriver in the household is explained by its functionality and the ability to significantly facilitate some of the stages of construction and finishing work.

You may not know which electric screwdriver is better, but you will definitely appreciate all its capabilities at its true worth, especially those who have previously screwed in screws with a screwdriver. But, like any technique, the cordless electric screwdriver loses its former efficiency over time and no longer works with the same power as before. How would you solve such a problem if it occurs? Of course, you can buy another battery, but the cost of a new battery “bites”, because the masters offer an alternative. to make a 12V power supply for an electric screwdriver with your own hands. This is a great way out of the situation and a great opportunity to try your hand at radio engineering.

Car battery as a power source

A car battery is a great option for remotely connecting an electric screwdriver to the mains. To realize the idea, simply disconnect the clamps from the work tool and power up to a power source.

Important! The use of such source for long-term operation of an electric screwdriver is highly discouraged.

What you need to know when starting to design

Study the markings or design features indicated on the body of the working tool, and, based on these indicators, determine the required voltage for the power supply. In our case, it will be enough to assemble a 12V power supply for an electric screwdriver with your own hands. If the required readings are different from 12V, keep looking for an interchangeable option. Having chosen an analogue, calculate the current consumption of the electric screwdriver, since the manufacturer does not indicate such a parameter. To find out, you need to know the power of the device.

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If you do not have time to select a device, and the calculations take too much time, take any power supply you come across. When buying it, in addition to current, ask about the battery capacity. To design a 12V power supply for an electric screwdriver with your own hands, a device with a capacity of 1.2A and a charge of 2.5 will be enough. Remember, before looking for a recharge, determine the following necessary parameters:

  • Block dimensions.
  • Minimum current.
  • Required voltage level.

Using a welding inverter to power an electric screwdriver

To remake an old structure, prepare a power supply circuit for a 12V electric screwdriver. The old design is improved to some extent by adding a secondary coil.

When compared to a computer battery, the advantage of an inverter is immediately noticeable. Thanks to the design features, it is immediately possible to determine the required voltage level and output current. This is the ideal method for those who live in radio engineering.

Materials and tools for upgrading an electric screwdriver

Alteration of a computer power supply for an electric screwdriver is not difficult, moreover, such an activity is informative, especially for beginners in the field of radio mechanics. With the necessary skills and all the components, in a short time you will have a transformed networked electric screwdriver. To carry out the work, you will need:

  • charger from an electric screwdriver;
  • old factory battery;
  • soft stranded electrical cable;
  • soldering iron and solder;
  • acids;
  • insulating tape;
  • power supply from a computer (or other).

Repair: 12v cordless drill battery replacement

Transformation options

Various power supply options can be used to create a compact battery for trouble-free operation of the electric screwdriver.

Stages of preliminary work: preparing for design

Before proceeding with the alteration of the battery, select another power supply unit that is suitable in size, in the future it must be placed in the existing case and secured. From the inside of the prepared device, everything is cleaned and the internal space is measured, which differs in comparison with the external content.

Replacement highlights

Knowing the most crucial points will help to avoid mistakes when reworking batteries:

  • Use of exclusively high-quality and original components.
  • Replacement with lithium substitutes is made by calculating the number of batteries.
  • The quantity is calculated from the calculation of 3.7 V per cell.
  • The sizes of the cans are different compared to Ni-Cd, which requires additional installation of the charging and discharging controller cells.
  • Do not rush to dispose of your own battery, by means of diagnostics, the possibility of its repair is established.

Electric screwdriver batteries

Soldering the battery wires with the module

Before soldering the wire, the surface is treated with flux, the ends of the wire are stripped. A classic 25 watt soldering iron is used to connect the wire to the contact area of ​​the block. A low-melting compound is used for the solder. Final melting should take no more than 3 seconds.

Types of cell connections in batteries

  • Series connection. positive pole connects to negative.
  • Parallel connection. positive pole attaches to positive, negative to negative.

Important. Lithium batteries cannot be soldered, as they become unusable from high temperatures.

Preparatory stage

Haste will never lead to the expected result. Step-by-step instructions for changing batteries begins with the preparatory stage.

Before starting work, it is necessary to determine the number of units used in the battery, which will significantly affect the level of the final voltage. It is equally important to select the correct lithium component to be used. The indicator of discharge current and capacity deserves special attention. Don’t forget about the controller too.

The characteristics of the part are compared with the indicators of the rated voltage and discharge current. In other words, to assemble 14V power supplies, you need a controller with the same voltage level.

Features of the choice of lithium batteries

The lithium-ion generation is the most modern. When choosing a battery, you need to pay attention to the following indicators:

  • Number of discharging and charging cycles available (latest models are capable of discharging up to 600 times).
  • Charging speed (maximum 2 hours).
  • Price (no more than 50% of the cost of an electric screwdriver).
  • Full Power Feature.
  • Battery level memory.
  • Self-loading.
  • Dimensions (edit).
  • Resistance to temperature extremes.

Removing the battery case

Each user is able to independently disassemble the case, which consists of two parts connected with screws and glue. The screws are unscrewed, the glue layer is broken with a thin object, which is pushed along the entire perimeter.

After the repair, the screws are installed in their original place, and the adhesive layer is renewed.

Assembling the battery

After checking the internal resistance of each cell, it is allowed to proceed with the assembly of the battery. The collected cells are placed in the bag, taking into account the polarity. Then the balancers and power wires are connected, the packages are connected to each other.

There are 2 techniques for connecting the battery. soldering and bolting. Soldering the part means ensuring the reliability of the connection, but if you are not confident in your own skills, it is better to choose an alternative option and select the elements intended for bolting.

After the tie, all the elements are placed in a pre-prepared box with a hole for cables. BMS board and balancers are mounted. After the output of the power wires, the holes are sealed.

battery, electric, screwdriver

Battery cell connection

The connection of Li-Ion batteries for a screwdriver is performed in several ways:

  • The use of special cassettes. The method is fast, but the contacts have a large transition resistance, they can quickly collapse from relatively high currents;
  • Soldering. A method suitable for those who know how to solder, since you need to have certain skills. Soldering should be done quickly, because the solder cools quickly, and prolonged heating can damage the battery;
  • Spot welding. This is the preferred method. Not everyone has a welding machine, such services can be provided by specialists.

Important! The elements must be connected in series, then the voltage of the batteries is added up, and the capacity does not change.

At the second stage, wires are soldered to the contacts of the assembled battery and to the protective board according to the connection diagram. To the contacts of the battery itself for power circuits, wires with a cross-sectional area of ​​1.5 mm² are soldered. For other circuits, you can take thinner wires. 0.75 mm²;

A piece of heat shrink tubing is then placed over the battery, but this is not required. You can also put on heat shrinkage on the protective microcircuit to isolate it from contact with the batteries, otherwise sharp soldering projections can damage the cell shell and provoke a short circuit.

Battery selection

12 V batteries are often used for screwdrivers. Factors to consider when choosing a Li-Ion battery for an electric screwdriver:

  • In such instruments, elements with high values ​​of the discharge current are used;
  • In many cases, the cell capacity is inversely related to the discharge current, so it cannot be selected based on capacity alone. The main indicator is the current. The value of the operating current of an electric screwdriver can be found in the instrument’s passport. Usually it is from 15 to 30-40 A;
  • It is not recommended to use cells with different capacities when replacing the battery of an electric screwdriver with a Li-Ion 18650;
  • Sometimes there are tips to use a lithium battery from an old laptop. This is absolutely unacceptable. They are designed for a much lower discharge current and have inappropriate technical characteristics;
  • The number of elements is calculated based on the approximate ratio. 1 Li-Ion to 3 Ni-Cd. For a 12-volt battery, you will need to install 3 new ones to replace 10 old cans. The voltage level will be slightly reduced, but if 4 cells are installed, the overvoltage will shorten the life of the motor.

Important! Before assembly, it is necessary to fully charge all elements to equalize.

Tips for choosing a security chip

The lithium ion battery of the electric screwdriver cannot function normally without the BMS protection board. Instances on sale have different parameters. BMS 3S marking assumes, for example, that the board is designed for 3 elements.

What you need to pay attention to in order to choose a suitable microcircuit:

  • The presence of balancing to ensure the uniformity of the charge of the cells. If it is present, the value of the balancing current should be in the description of the technical data;
  • The maximum value of the operating current withstood for a long time. On average, you need to focus on 20-30 A. But this depends on the power of the electric screwdriver. Low-power enough 20 A, powerful. from 30 A;
  • Voltage, upon reaching which the batteries are disconnected when overcharging (about 4.3 V);
  • Voltage at which the electric screwdriver turns off. It is necessary to select this value based on the technical parameters of the battery cell (the minimum voltage is about 2.6 V);
  • Overload protection operation current;
  • Resistance of transistor elements (minimum value selected).
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Important! The magnitude of the overload tripping current is not very important. This value is offset from the workload current. In case of short-term overloads, even if the tool has turned off, you must release the start button, and then you can continue to work.

Connection diagram of elements with a protective board

Whether the controller has an autorun function can be determined by the presence of an “Automatic recovery” entry in the technical data. If there is no such function, then in order to restart the electric screwdriver after the protection is triggered, it will be necessary to remove the battery and connect it to the charger.

Battery assembly

Further battery replacement consists of the following steps:

  • The disassembled parts of the case are well cleaned;
  • Since the dimensions of the new battery cells will be smaller, they must be securely fixed: glued to the inner wall of the case with Moment glue or sealant;
  • The positive and negative wires are soldered to the old terminal block, it is placed in the same place in the case and fixed. The protective board is laid, the parts of the battery pack are connected. If they were previously glued, then “Moment” is used again.

Disassembling the battery case

The body is often assembled on self-tapping screws, other options are assembled with latches or glue. The glued block is the most difficult to disassemble, you have to use a special hammer with a plastic head so as not to damage the parts of the case. Everything is removed from the inside. You can reapply only the contact plates or the entire terminal assembly for connecting to the tool, charger.

Difficulties in rework

There are objective disadvantages in Li-Ion batteries, such as poor performance at low temperatures. In addition, when converting an electric screwdriver to lithium 18650 batteries, a number of difficulties can be encountered:

  • The 18650 standard means that a single cell has a diameter of 18 mm and a length of 65 mm. These dimensions do not match the dimensions of the nickel-cadmium or nickel-metal hydride cells previously installed in an electric screwdriver. Replacing batteries will require placing them in a standard battery case, plus the installation of a protective microcircuit and connecting wires;
  • The voltage at the output of the lithium cells is 3.6 V, and on the nickel-cadmium cells. 1.2 V. Let’s say the nominal voltage of the old battery is 12 V. This voltage cannot be ensured when Li-Ion cells are connected in series. The range of voltage fluctuations during the charge-discharge cycles of the ion battery also changes. Accordingly, converted batteries may not be compatible with an electric screwdriver;
  • Ionic batteries differ in the specifics of their work. They do not withstand overcharging voltage more than 4.2 V and discharge less than 2.7 V until they fail. Therefore, when a battery is being reworked, a protective board must be installed in an electric screwdriver;
  • An existing charger may not be used for an electric screwdriver with a Li-Ion battery. You will also need to redo it or purchase another.

Important! If the drill or electric screwdriver is cheap and not of very high quality, then it is better not to rework. This can cost more than the cost of the tool itself.

Conversion of an electric screwdriver to lithium batteries 18650

The industry has been making screwdrivers for a long time, and many people have older models with nickel-cadmium and nickel-metal hydride batteries. Converting an electric screwdriver to lithium will improve the performance of the device without buying a new tool. Now many companies offer services for altering batteries for an electric screwdriver, but you can do it yourself.

Conversion of an electric screwdriver to lithium batteries

The advantages of lithium-ion batteries

Nickel-cadmium batteries have a low price, withstand many charging cycles, and are not afraid of low temperatures. But the capacity of the battery will decrease if you put it on charge without waiting for a full discharge (memory effect).

Lithium-ion batteries offer the following benefits:

  • high capacity, which will provide a longer operating time for the electric screwdriver;
  • smaller size and weight;
  • keeps charge well when inoperative.

But a lithium battery for an electric screwdriver does not withstand a full discharge, so factory tools on such batteries are equipped with additional boards that protect the battery from overheating, short-circuit, overcharge in order to avoid an explosion, a complete discharge. When the microcircuit is inserted directly into the battery, the circuit is opened if the unused battery is separated from the tool.

Do-it-yourself flashlight with a battery from an electric screwdriver

On the Internet, you can find many options for using rechargeable batteries from screwdrivers, but one of the most useful is a flashlight that will illuminate the workspace. Everyone can make such a homemade product, and it will really be needed often. For a flashlight, even a battery is suitable, which is no longer able to normally support the operation of an electric screwdriver.

Required materials and tools

To assemble a flashlight, you need a minimum of materials that, most likely, can be found in the house of a real jack of all trades:

  • Battery from a 12 V electric screwdriver. An old power source that does not do its job well will do. You can also use a good battery. it will still be possible to connect a power tool to it;
  • Small plug with socket. Any options for two contacts are suitable, but it is better to find special cylindrical plugs for powering low-voltage equipment;
  • Small wires;
  • A drill case is well suited as a shade. Another hollow transparent cylinder can be used. The main thing is that its length is not very small;
  • White LED strip. The colored one will look more original, but there is no practical sense in it.

Of the tools, only a soldering iron, a knife and a drill should be at hand.

How to do it yourself

If you have everything you need, then the process of assembling the flashlight will take no more than 20 minutes. First of all, you need to open the battery case. There are several power supplies and wires inside. In the case, you need to make a hole for the flashlight power socket. It must be mounted so that it is on top when the battery itself is on the table, and at the same time it does not interfere with connecting to the screwdriver. You need to solder two wires to the connector taps, and then fix it in the hole in the case.

When the connector is mounted, you should solder the wires from it to the contacts going to the electric screwdriver. It is important not to mix up the polarity. the positive side of the socket is centered and the negative side around. This completes the work with the batteries themselves, and its case can be assembled.

Now you need to assemble the flashlight itself. To do this, a hole is made in the plug from the drill case for a cylindrical plug. The part, with pre-soldered wires to the contacts, is fixed in the cover. A piece of LED strip must be soldered to the wiring, the length of which must correspond to the length of the transparent case.

The polarity of the connection should be taken into account. plus comes from the center contact. The tape is driven into the cavity and the plug is tightly closed. This completes the work with a homemade flashlight with a battery from an electric screwdriver.

Now, if you plug the plug into the socket on the battery, the light will turn on, which is quite enough to illuminate the workspace. Thanks to such a simple gadget, you can save on buying a flashlight. Budget Chinese lanterns usually fail quickly, and you don’t always want to buy an expensive model for rare use. It is in this case that a flashlight powered by an electric screwdriver battery will be the best solution.