How to Charge an Electric Screwdriver

How to use an electric screwdriver correctly

Many beginners often have the question of how to use an electric screwdriver, when first familiarizing themselves with it. This is the case with almost everyone, but learning the principles of operation and rules of operation does not take much time due to the fact that modern tools are convenient and easy to use at home.

electric screwdriver in the home can be applied everywhere, as modern devices in the home can easily replace the drill, screwdriver and even the grinder with infrequent use. This requires special attachments, which can be purchased in many construction stores.

Almost any work associated with assembly/disassembly or installation of fasteners is accelerated several times faster when using a cordless electric screwdriver rather than a hand-held tool.

How to properly charge an Interskol electric screwdriver battery: Other information

The temperature environment during charging also affects the cells. Its acceptable range: minus 10, plus 40 degrees, optimum: 10-35 degrees above zero.

After finishing the process it is necessary to disconnect charger from a network and take out a battery. The process of recharging itself takes different amount of time, depending on the model of the device and can be from one to seven hours.

Lithium power cells should be stored only slightly discharged (about 70%) and kept out of all devices. Even at rest the charge is lost slowly, so if the downtime is delayed, the battery needs to be recharged when it reaches the level of 20%.

Nickel-cadmium batteries, on the contrary, are stored discharged, otherwise their efficiency is greatly reduced.

If the rules of charging have not been observed and the battery is out of order, or after years of operation has exhausted its resource, a new battery or other components for power tools, digital technology can be purchased at low cost in our online store

To know how to charge a Hitachi electric screwdriver battery, you need to determine what type of battery cells it has. These can be nickel cadmium batteries.

If the battery has stopped holding a charge, and quickly buying a new one in the near future is difficult, the situation can be corrected if you know how to restore the battery.

We offer the widest range of batteries and accumulators for probably any device!

Types of batteries used to operate an electric screwdriver

To understand how to charge an electric screwdriver correctly, you need to know the type of battery installed in the unit. This information can be found on the model in English letters. There are 3 types of Ni-Cd batteries used in construction of power tools:

    Nickel-cadmium (Ni-Cd). The popularity of these batteries is due to their low price, long life (10 years), little heating, possibility of long-term storage in a discharged state, ability to function at low temperatures. These cells have a “memory effect” which leads to a rapid loss of capacity if recharged frequently. Another disadvantage highlight the toxicity of the internal filling.

Nickel-cadmium batteries are the most budget-friendly and durable power sources, but due to their high toxicity their use is prohibited in many European countries. Li-ion type variants do not have this drawback, but their price is much higher.

How to charge the battery of a screwdriver without a charger

How much to charge the battery of a Bosch electric screwdriver

Modern devices to replenish equipment with electricity are equipped with an energy indicator. You should unplug the power adapter immediately after the green light turns on, indicating that charging is complete. The minimum time required for this process. half an hour. It may be increased depending on the type of battery. The longest refill period of the electric power has a storage battery of nickel-cadmium type. It takes about 7 hours for such a cell to fully enrich with electricity.

The manual for your Bosch electric screwdriver has a more precise battery charging time. There you will also find a detailed description of the process for your battery model. It is a good idea to follow the instruction manual completely when using the equipment. This will extend the service life of both the device itself and the power source. Therefore, before you charge a Bosch electric screwdriver battery for the first time, it is advisable to read the instructions carefully.

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Features of different types of batteries charging

Differences in battery charging are related to the properties of the materials from which the batteries are made. Reclaimers are available in both pulse and conventional versions. the battery is the battery that powers professional power tools and the battery that powers home electric screwdrivers.

There are three types of batteries in total:

  • Nickel-cadmium. They are characterized by a pronounced memory effect. After purchase, they must be charged and discharged three times. This is the only way to achieve the highest capacity battery. Subsequent charging should only be done when the charge is complete.
  • Nickel-metal hydride. They also have a memory effect. It is recommended to perform the same procedure 4 times. Further recharging is arbitrary.
  • Lithium-ion. These batteries are the most rugged. They can hold their original capacity for a long time. They can be charged as desired.

Peculiarities of lithium-ion batteries charging

On how to properly charge the battery of an electric screwdriver with a lithium-ion battery, you can not think at all. Devices have only a nominal “memory effect”. It does not affect the overall functionality. It is appropriate to recharge such a module when it is convenient, not paying attention to the current level of battery capacity.

How long does it take to recharge

Just before you charge the battery on your electric screwdriver, you must carefully study the instructions for the tool. It will definitely indicate the time required to charge the unit “to the full”. These timing should be adhered to. Usually from half an hour to 7 hours.

Separate screwdriver chargers have an indication system. It allows you to monitor the process and stop it in time when the battery has reached full capacity.

Lithium-ion modules need more care. They are sensitive to complete discharge and overcharging. Both of these parameters cardinally decrease the life time of the units.

The nuances of the temperature regime

Find out the ambient temperature is necessary before activating the recharging. Not lower than 10°C and not higher than 40°C. Battery sometimes becomes warm as it reaches its working capacity, and overheating is strictly forbidden. In the future, this has a bad effect on the device and reduces its performance.

Process engineering

Just knowing how to properly charge an electric screwdriver battery is not enough. It is very important to observe the following rules:

  • do not leave the battery in the charging unit;
  • Store the feeding block separately from the instrument in a dry place without temperature fluctuations;
  • If used infrequently, recharge the modules once a month or as prescribed in the supplied manufacturer’s instructions.

This will extend battery life and keep your electric screwdriver in perfect working order at all times.

How to resuscitate a battery

Since an electric cordless screwdriver battery consists of many individual cells, battery failures can be caused by several reasons.

  • Failure or malfunction of the cell block control system (charge controller, voltage level).
  • Change of parameters or failure of one of the batteries.

It is quite easy to determine if a battery needs diagnosis and reanimation. Malfunction with the controller manifests itself as a failure in charging, its continuity to the overheating of the entire battery block, the lack of voltage.

charge, electric, screwdriver

Problems of individual units are diagnosed more varied, from complete battery failure to various cases of changes in battery voltage and usable capacity. The method of resuscitation depends primarily on the type of individual battery cells.


A standard check of lithium-ion batteries looks like this.

  • The control board is removed. It is replaced with a working one taken from another unit of the same type.
  • The individual batteries are removed and tested. With the help of an adjustable power supply each battery is supplied with 4V with a current of 200 mA. If the voltage rises, the unit is good.

If the battery does not work because of the failure of a single cell, it is not difficult to find and replace the culprit. But there are other problems with this type of battery.

Lithium-ion batteries have a standard technology feature: The charge carrier in them decomposes. Therefore, despite the lack of memory and the stable voltage limit set, in normal operation, after three years the capacity of the product drops by a factor of 2.

charge, electric, screwdriver

However, there is another problem within the whole battery. It is called unbalanced power units. It appears in the form of a gradual reduction in the useful capacity, running time of an electric screwdriver. You can only determine the unbalance if you disassemble the battery. All units are removed. Preferably this should be done after the battery is fully charged. Each battery is tested. If some have less voltage than others, the imbalance must be corrected.

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This problem is known to e-cigarette users. Today there are many battery charger options on the market that can eliminate the unbalancing of a group of lithium-ion batteries. But in households you can use a cheaper method: charge each of the cells separately. When doing so, it is recommended that you find the manufacturer’s data on the rated currents and charge times. Using an adjustable power supply, you can discharge the cells to the same level.

Balancer board for lithium-ion batteries


Nickel-cadmium batteries have little memory effect, can withstand sub-zero temperatures, and hold their charge for a long time without noticeable performance degradation. However, their design features also contribute to some of the negative factors of failure.

First, nickel-cadmium batteries have an electrolyte. It evaporates over time. As a result, no amount of reanimation will help. The battery must be replaced.

Second, nickel-cadmium batteries are sensitive to mechanical effects. One of a couple of basic reanimation methods is based on this. The element can be recovered:

29 for Xiaomi Mijia Electric Screwdriver UNISEX Tool

  • deforming or, conversely, returning the cell to its original shape;
  • by applying higher voltages and currents using a regulated power supply.

Use the latter method with care. It is recommended that you look up the rated currents for a particular battery class. It is useful to learn from other users’ experiences with similar resuscitation measures.

How to replace the individual batteries

Actually, some of the necessary work is already done when testing the battery. Namely, the case is opened and the individual batteries are exposed.

To replace them is not difficult. First you need to find a donor. It can be a second battery of the same type. It is not difficult to order completely new batteries. The main thing is to determine their type, capacity, voltage, and, if available, the marking. After that, it is easy to find everything you need for repair on the Internet.

Replacement work is simple. The old element (damaged or with reduced parameters according to the test results) is unsoldered and a new one is installed in its place. Recommended:

There are also simple rules that will help to successfully complete the repair. First, it is better not to change the original connecting elements. Do not cut off the old battery, but solder it out. If it is not possible to save the plates, copper plates are used instead.

Secondly, you need to strictly follow the correct polarity. When removing an old element, it is recommended to either memorize its position or take a picture. Finally, the solder must be fast. The heating of the battery can ruin it right in the process of installation.

The repair is completed by equalization. For this, the battery is subjected to a charge-discharge cycle. Accumulate the capacity of the battery must be at least 8 hours. After the final charging, after several cycles, leave the battery for a day and measure the voltage on each of the batteries. If it is about the same, then the repair was successful.

Types of batteries

For the battery to serve for a long time “like clockwork”, you should first read the instructions that come with the device. It should be noted that screwdrivers differ not only in price, power, manufacturer, but also are divided into professional and semi-professional. Accordingly, batteries will also have different price, quality and charge capacity. The professional types are equipped with higher-capacity power sources, which will cost a level more, but will also last longer than conventional ones. Manufacturers use different batteries in the manufacture of their devices, each of which is endowed with certain parameters and features that should be taken into account during recharging. Batteries for screwdrivers can be classified into these types:

Considered to be the most powerful batteries. They charge quickly enough, and they have no memory effect at all. Charging this type of battery is easy. There is no need to recharge it after a complete discharge, recharge it as needed. High cost and intolerance to low temperatures discourage many people from buying them, so they are not in high demand. Batteries should be charged at a temperature of 10 to 40 ° C. If a battery gets hot during charging, it needs to be cooled down to avoid further damage.

Nickel-cadmium Ni-Cd

Nickel cadmium battery is endowed with compact size and large capacity. Following the enclosed instructions it is possible to recharge it more than 1000 times. There is a memory effect, if it is charged before a full discharge occurs, this can reduce the energy capacity. Charge and discharge the rechargeable battery at least three times before first use. In the future, it is also recommended to fully discharge and charge the device, this will give an opportunity to bring the capacity to the required working condition. The same rule applies during tool storage.

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Nickel-metal hydride Ni-MH

Belongs to the latest generation of batteries, for this reason, the memory effect is somewhat weaker than the previous variety, which is a definite plus. Disadvantage of NMGB. the highest self-discharge current. To keep the battery running for a long time, it must be kept charged. In case the electric screwdriver is not used for a long time (about a month), it should be fully recharged.

As you can see, each battery is endowed with specific characteristics, taking into account which will allow you to properly charge your electric screwdriver.


The charger suggested below provides the correct charging current for any of the batteries listed. Screwdrivers are powered by batteries with different voltages of 12 volts or 18 volts. It doesn’t matter, the main parameter of a battery charger is the charging current. The charger voltage with the load disconnected is always higher than the rated voltage, it drops to normal when the battery is connected during charging. During charging, it corresponds to the current state of the battery and is usually slightly higher than the nominal at the end of charging.

The charger is a current generator on a powerful compound transistor VT2, which is powered from a rectifier bridge connected to a step-down transformer with a sufficient output voltage (see the diagram). table in the previous section).

This transformer should also be powerful enough to provide the current needed for continuous operation without the windings overheating. Otherwise it might burn out. The charging current is set by adjusting the resistor R1 with the battery connected. It remains constant during charging (the more constant the voltage from the transformer is, the higher the voltage is). Note: the voltage from the transformer must not exceed 27 V).

The resistor R3 (at least 2 W 1 Ohm) limits the maximum current and the LED VD6 remains illuminated as long as the charge is going on. Towards the end of the charge, the glow of the LED decreases and it goes out. However don’t forget about a precise control of the voltage and the temperature of the lithium-ion batteries!

All the parts in the circuit described are mounted on a foil board. Instead of diodes, mentioned in the schematic, you can take Russian diodes KD202 or D242, they are quite available in old electronic scrap. Arrange the parts so that there are as few junctions on the board as possible, ideally none. You should not be too dense, after all you are not assembling a smartphone. It will be much easier to unsolder parts if you leave 3-5mm between them.

The transistor has to be mounted on a heatsink with sufficient space (20-50 cm).sq). It is best to mount all parts of the charger in a handy home-built housing. This will be the most practical solution, in your work nothing will interfere. But here you may have great difficulty with the terminals and the connection to the battery. So it is better to do this: take an old or faulty charger from a friend that fits your battery model, and subject it to modification.

  • Open the case of the old battery charger.
  • Remove all of its former stuffing.
  • Select the following radio elements:
charge, electric, screwdriver
  • Choose the right size for the circuit board to fit in the case with the parts from the circuit shown, paint its tracks with nitro paint according to the circuit diagram, etch in copper sulfate and solder all the parts. The radiator for the transistor should be mounted on an aluminum plate so that it does not touch any part of the circuit. The transistor itself is screwed tightly to it with an M3 screw and nut.
  • To assemble the board in the case and solder the terminals as per the circuit diagram, making sure that the polarity is correct. Take out the wire for the transformer.
  • Transformer with 0 fuse.5A into a small matching case and provide a separate connector for the converted charger. It is best to take connectors from computer power supplies, install the dad in a case with a transformer, and connect the mom to the bridge diodes in the charger.

The assembled device will work reliably if you are careful and thorough

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