How to Charge a Screwdriver Without a Charger

How can I charge a screwdriver battery without a charger?

  • Main classification
  • Step-by-step instruction
  • Conclusion on the topic

Before you charge the battery of a screwdriver without a charger, you will need to read the instructions. Homemade charger is made taking into account the type of battery.

How to Charge a Screwdriver Without a Charger

Main classification

Specialists distinguish the following categories of a screwdriver:

  • Domestic;
  • Semi-professional;
  • Professional.

Since the battery is designed for a specific job and load, an appropriate charger is required for each type of tool. The duration of the tool depends on the battery power. Specialists distinguish the following types of batteries:

Table of battery characteristics for a screwdriver.

Type 2 of the battery, unlike the others, is compact, has a greater energy intensity. With proper use, the tool can charge more than 1000 times. It is necessary to charge the screwdriver battery subject to the following rules:

  1. Full battery charge. Otherwise, the energy carrier capacity and tool life will decrease.
  2. Toxicity of nickel-cadmium battery (must not be dropped).
  3. The nickel-metal hydride battery is developed using new technology and is environmentally friendly for humans. It can often be charged. If the tool is not in use, then the battery is stored in a charged state. When the screwdriver is at rest for a long time, the battery is completely discharged.
  4. The lithium-ion device does not have a memory effect. The battery has a high power consumption. Due to its exposure to the negative effects of low temperatures, the lithium-ion battery is not used in the winter.

To make a battery charge for a do-it-yourself screwdriver, you will need the following materials and tools:

Decoding of the indicators of the charger.

  • Charging cup;
  • Damaged battery;
  • 2 wires 15 cm long;
  • Soldering iron;
  • Screwdriver;
  • Drill;
  • Knife;
  • Thermal gun.

Using a soldering iron, solder the terminals of the damaged battery. Markers on the cover of the device make notes where there was a minus and a plus. If necessary, the prepared holes are adjusted to the desired size. To do this, use a blade.

The next step is to lay the wire through the holes. The cable is soldered to the glass, taking into account the polarity. To prevent the connector from falling apart, cardboard is inserted into the battery. The bottom cover is attached to the charging cup. The resulting design is inserted into the adapter, and then into the battery.

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To charge the device, you can charge from a USB source. To do this, use a socket, USB-charging, fuse (10 A), connectors, paint, electrical tape and adhesive tape. The screwdriver is disassembled into parts. The upper case is cut off from the handle with a knife.

Charger diagram for a screwdriver.

On the side of the handle make a hole for the fuse. The wire is connected to the fuse and mounted in the handle of the unit. To fix the fuse, glue and a thermal gun are used. The case is wrapped with tape. The resulting design is connected to the battery connector. At the top of the screwdriver mount the wires. The tool is assembled with your own hands and wrapped with electrical tape. The case is ground and coated with paint. The resulting device is being charged.

Before buying a screwdriver, it is recommended to pay attention to its power. If the tool will be operated at home, then you can purchase a unit with a rotation speed of 10-15 Nm. A tool with an internal force of not more than 130 Nm is suitable for professionals. The buyer should pay attention to the number of revolutions per minute. The tool, which will be used at home, must perform 400-500 rpm, and a professional unit. 1200-1300 rpm.

The main indicator of the choice of a screwdriver is power. The higher this indicator, the longer the tool will work. The product kit includes 2 batteries (one for operation, a second for charging). In the manufacture of a homemade charger, the KT829 transistor is used. Pre-prepared device diagram. To limit the charging current, a resistor with a resistance of 1 ohm is used.

Through the battery, the charging current is controlled by the KT361 transistor. A collector is used to control the charge indicator. 1 element is responsible for the operation of a composite transistor. The charge current depends on the duration of charging. In the manufacture of a home-made device, the charge threshold is taken into account. This number should be greater than the value of this indicator when charging at maximum battery capacity.

Experts recommend using a TP-20-14 transformer for a makeshift charger.

It can be dismantled from the black-and-white TV Electronics-409. The voltage of the transformer is 9 V, and the current strength is 1 A. It is recommended that the resulting device be placed in a plastic case suitable for the parameters.

How to charge a screwdriver battery without a charger

Cordless screwdrivers and drills quickly entered the domestic market of construction tools and tightly fixed on it. It is noteworthy that these devices are quite problematic. Firstly, batteries often fail, and in order to avoid regular breakdowns, you must initially buy expensive devices. Secondly, chargers break even more often, which, by the way, are also not so cheap. The second problem, in principle, can be solved independently. It is enough to figure out how to charge the battery of a screwdriver without a charger. There is a specific instruction, observing which, you will be able to return the screwdriver to a working state within a minimum time.

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Charging a screwdriver. Safety Precautions

Please note that the following methods allow you to charge the screwdriver with direct current. In this case, you must constantly monitor the process and the full charge of the battery. The fact is that upon completion of the process, the electrolytes inside the battery cans begin to boil. This contributes to a significant increase in the temperature of the battery itself. In addition, the slightest spark can cause the device to rupture.

A set of materials for the independent manufacture of the charger

Naturally, to do the charging yourself, you will need additional materials and tools. It:

  • Old damaged battery.
  • Two wires, with a length of 15 centimeters.
  • Charging glass.
  • Thermal gun.
  • Drill.
  • Knife.
  • Soldering iron.
  • Screwdriver.

Most of the above you most likely already have, so there will be no big expense for creating the device. First, remove the terminals from the old battery. To do this, use a soldering iron. In order not to reverse polarity, make notes directly on the device case. Now the holes need to be adjusted to the desired size using a knife. Next, we pull the wire through the finished holes and solder to the charging cup, taking into account the polarity. The design is still quite fragile, so put cardboard in the case. Attach the bottom of the battery directly to the charging case. You have a finished design. Now it can be inserted into the adapter and mounted in the battery case itself.

How to charge a screwdriver battery without a charger using USB

To make a charger that works using a USB port, you need:

  • 10a fuse.
  • Any USB charger.
  • Socket 220V.
  • Connectors
  • Insulating tape.
  • Scotch.
  • Paint.

The process of charging a screwdriver from USB

First you have to disassemble the tool itself. The upper working part from the handle must be separated with a knife. A special hole is made in the handle, where a 10A fuse is installed. The wire is connected to the fuse with a soldering iron and the design is inserted into the handle housing. To fix the fuse, use glue and a thermal gun. For greater reliability, it is recommended to wrap the handle with tape. The resulting device is inserted into the battery of a screwdriver. The remaining wires are mounted at the top of the screwdriver. The case is wrapped with electrical tape, covered with paint and polished. A detailed diagram is as follows: A detailed process for charging the battery of a cordless screwdriver is shown in this:

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How to charge a screwdriver battery without a charger?

The situation when the screwdriver’s charger is unavailable, or failed, cannot be called a regular one, so there is no easy solution to this problem. The best way out of this situation is to find and purchase a charger suitable for your model, since only it can safely and accurately charge the batteries of your particular tool. If this is not possible, there are fallback options:

  • Charge the battery with a car charger;
  • Purchase universal charging;
  • Remodel the power tool to be powered by an external battery.

Using a car charger

The main danger when using this method is overcharging the battery. The batteries used in power tools differ in their characteristics from automotive lead batteries. Charging equipped with electronic adjustment of current and voltage is suitable.

The charging current is selected from a calculation of 0.5 to 0.1 of the battery capacity in Ah. So, with a capacity of 1.3 Ah, the charging current is set from 650 to 130 mA. Chargers for lead batteries are designed to work with high currents, and the required value may be outside the range of their work. In this case, to limit the current, ballast resistance is applied, connected in series with the battery. As a resistance, a car lamp can be used.

Universal Chargers

The purchase of such a device is justified if, in addition to the screwdriver at home, there are other battery-powered equipment. In this capacity, laboratory power supplies or model charges can act. The advantage of this type of devices is their versatility and many adjustments with which you can set the desired charging mode.

Using an external power source

This is not the most convenient option in terms of operation. In the case when the tool is already old, and to purchase additional equipment for it, this is too much cost, it can be used. For this upgrade, a battery with the appropriate voltage is suitable. Using a powerful battery, motor protection should be provided. The easiest option is a 10 A fuse installed in the power circuit. Do not forget that the wires, when using low voltage, should have a larger cross-section than when powered from a 220 V.

When using abnormal equipment for charging a screwdriver, make sure that the devices are connected correctly, that the charging mode meets the technical specifications of the battery, and ensure the safety of the process.