How to charge the battery of an electric screwdriver without a charger

How to handle a storage battery

Experts are very scrupulous about the storage of all tools, and this is directly related to batteries. The rechargeable batteries of an electric screwdriver, which include nickel-cadmium cells, must be discharged to the point of extinction, but not completely to zero. If storage is to be carried out for a long time, after its end, it is recommended to charge / completely discharge the battery 3 or 5 times.

IMPORTANT: The process of operating nickel-cadmium batteries of an electric screwdriver should not allow the remainder of the power in the device, the presence of a memory effect causes the absolute discharge of such batteries before connecting to the power supply.

If nickel-metal hydride batteries for an electric screwdriver are sent for storage, they require periodic “refueling”, and before use after a break, the power should be allowed for about 24 hours. These batteries prefer partial rather than full discharge. After 200-300 charge-discharge cycles, the capacity of batteries with nickel-metal hydride components is significantly reduced.

How To charge Cordless Tool Battery Without Its Charger

Least fussy. lithium-ion batteries, which are optimally charged at 50% capacity.

A full discharge of lithium-ion batteries in an electric screwdriver can disable their protection circuit. Manufacturers guarantee the service life of such rechargeable batteries for 24 months.

Charger for Interskol Electric Screwdriver

The power section of the screwdriver charger is a power transformer type GS-1415 designed for a power of 25 watts.

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A reduced alternating voltage of 18V is removed from the secondary winding of the transformer, it follows on diode bridge of 4 diodes VD1-VD4 type 1N5408, through a fuse. Diode bridge. Each 1N5408 semiconductor element is rated for forward currents up to three amperes. The electrolytic capacitance C1 smooths out the ripple appearing in the circuit after the diode bridge.

Management is implemented on a microassembly HCF4060BE. which combines a 14-bit counter with oscillator components. It drives a bipolar transistor type S9012. It is loaded on a relay of type S3-12A. Thus, a timer is schematically implemented, which turns on the relay for a time of charging the battery for about an hour. When the charger is turned on and the battery is connected, the relay contacts are in the normally open position. HCF4060BE receives power through a 12 volt zener diode 1N4742A, because about 24 volts goes from the rectifier output.

When the Start button is closed, the voltage from the rectifier begins to follow to the zener diode through the resistance R6, then the stabilized voltage goes to pin 16 of U1. The S9012 transistor, which is controlled by the HCF4060BE, turns on. The voltage across the open junctions of the S9012 transistor follows the relay coil. The contacts of the latter are closed, and the battery begins to charge. The protective diode VD8 (1N4007) bypasses the relay and protects VT from a reverse voltage surge that occurs when the relay winding is de-energized. VD5 prevents the battery from discharging when the mains voltage is disconnected.

Charging A Drill Battery Without An “Official” Charger

With the opening of the contacts of the Start button, nothing will happen, because the power goes through the VD7 diode (1N4007), the VD6 zener diode and the quenching resistor R6. Therefore, the microcircuit will receive power even after the button is released.

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Replaceable typical battery from the power tool is assembled from separate series-connected nickel-cadmium Ni-Cd batteries, each of 1.2 volts, so there are 12 of them. The total voltage of such a battery will be about 14.4 volts. In addition, a temperature sensor has been added to the battery pack. SA1 it is glued to one of the Ni-Cd batteries and fits snugly to it. One of the terminals of the thermostat is connected to the minus of the storage battery. The second pin is connected to a separate, third connector.

When the Start button is pressed, the relay closes its contacts and the battery charging process begins. The red LED lights up. An hour later, the relay with its contacts breaks the battery charge circuit of the screwdriver. The green LED lights up and the red one goes out.

A thermal contact monitors the battery temperature and breaks the charging circuit if the temperature is above 45. If this happens before the timer circuit works, this indicates the presence of a memory effect.

How to charge the battery of a screwdriver if there is no charger?

The screwdriver itself is in excellent condition, but the charger is lost, it turns out to be impossible to find the same.

We charge for the first and last time. Cycle the battery of the screwdriver.

Its functions are not limited to screwing and unscrewing self-tapping screws, with its help it is easy to drill holes.

The cordless electric screwdriver is very convenient for carrying out absolutely any work, as it allows you to move calmly without limiting cords.

Networked tools are not mobile, and it is not possible to use them if the room does not have an outlet. Cordless screwdrivers provide free movement and do not have a cord interfering with the operation. Questions may arise here: which device to choose and how to properly charge the battery of an electric screwdriver?

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Electric screwdriver battery charger

A little about the types of batteries

Please read the supplied instructions before purchasing a new battery. These devices differ in their capacity and quality, according to the class of the tool, its purpose and loads.

Screwdrivers use different types of batteries. The main ones are as follows:

Nickel-cadmium batteries can be charged over 1000 times, and they also have a large capacity in a small size.

  • nickel-cadmium
  • nickel metal hydride
  • lithium ion.

The first are the most common, they are large in capacity and small in size. Batteries are efficiently charged more than a thousand times, taking into account their design features, operating mode and correct charging. The specificity of these batteries is the presence of a memory effect, because the battery will have to be charged without waiting for it to be completely discharged, otherwise the battery capacity will gradually decrease.

Nickel-metal hydride batteries are safe in disposal, less manifestation of the memory effect, but are imperfect due to the high self-discharge current. Such batteries are stored only charged, in case of a break in operation for more than a month, they must be fully recharged.

Lithium-ion devices are more powerful. They do not have such a disadvantage as the memory effect, which requires periodic discharges, quickly charges and has a high capacity. However, an electric screwdriver with this type of battery is undesirable to use in the cold.

How To Charge Cordless Drill Battery Without Charger