How to charge the battery of an electric screwdriver from another battery

How to charge a Makita battery without a battery charger

The screwdriver itself is in excellent condition, but the charger is lost, it is unreal to find the same.

How to charge a screwdriver battery without a charger?

If you know the basics of electromechanics, you can find the battery voltage and capacity on the battery or screwdriver, on the body of the battery or screwdriver you will find the polarity. this is important!

Need a charger its characteristics define the data for example battery 18V and a capacity of 2A / h. so you need a charger capable of giving a charging current of 18V and a capacity of approximately 200Ma / h, as it charges, a longer time, but a smaller charge its enough to take 8-10 times less, adjust the charger, or buy exactly those characteristics.

charge, battery, electric, screwdriver, another

To supply charging current to the battery, use small crocodiles simply by hanging them on the current-splitting plates of the battery connector.

An ordinary rectifier for car batteries. It is extremely important not to reverse the polarity because not all screwdriver batteries are labeled. such as Makita’s. Tester is better to have on hand.

A current of 1 ampere is adequate and the charging time should not exceed half an hour, under constant supervision.

This method may save the situation once or twice, but you should not use it permanently. To obtain the battery life according to the manufacturer’s claims, only original chargers should be used that supply the correct voltage and charging current.

It is possible to charge with the car charger (C/C).

Set the minimum voltage on the device itself.

Remove the battery screwdriver, determine exactly where we have plus and minus (although different batteries, there may be nuances).

terminals from the charger to connect directly to the battery of the screwdriver, sometimes it is not possible, it is necessary to improve this assembly, using, for example, paper clips or plates.

That is all, turn on the charger, so as not to risk the battery screwdriver, control the charging time. 15, 20 minutes will be enough to begin with, as soon as the battery of the screwdriver becomes warm, unplug the charger.

a man used “Orion PW-260” battery charger to charge the battery of a Hyundai screwdriver.

And of course it is better to buy a native (or at least similar) charger, you can find almost any charger at the markets, even for older screwdriver model.

For quick repairs, disassembly and assembly of removable structures, a non-stationary device is used, which discharges in a short period of time with uninterrupted use. It is not always there is a native charger at hand, so you need to know how to charge the electric screwdriver without the charger.

Step 7: Assembly

Then our job is to isolate it well. I used ¾ roll of duct tape for this. First, wrap each connection so that no metal parts would stick out. Then wrapped it all together so the terminals wouldn’t touch each other.

When I assembled the electric screwdriver body, I wrapped electrical tape around the wires at the outlet of the body for insulation and fixation.

Congratulations! Now it does not matter if you forgot to charge the electric screwdriver or not and it does not matter how long the charge lasts. With this type of tool you can work for a long time, even in places where there is no electricity at all.

How you can do it? Isn’t it dangerous for an electric screwdriver?

Т.к. the work of an electric screwdriver is connected with jolts of voltage when switching on and off, the car battery is suited in the best way, because the normal mode of operation of the latter is associated exactly with the discharge-discharge mode. What about the damage to the device itself (screwdriver). there is no reason to be afraid it will consume as much as he needs. True, for the good work of an electric screwdriver from a car battery its operating voltage must be around 12V.

Connect an electric screwdriver to the battery can be a flexible copper cable to the poles “plus”/”minus” on the device and the battery respectively.

If the screwdriver is designed for 12 volts then you can, of course, connect it to your car battery and more.Suitable and the battery from the UPS it is also designed for 12 volts.The main thing is not to mix up the plus and minus terminals of the electric screwdriver.As a protection against improper switching you can try to connect a diode in the gap of one wire.This should just theoretically help against improper switching.

Generally speaking, you can if the screwdriver is 12 volt.

And then all the complexity, to carry a car battery is not convenient, you can of course buy here are such wires with alligators

To connect the screwdriver, it is necessary to remove the “native” battery, open the screwdriver (“split it in two parts, there are screws for a Phillips screwdriver).

Next, we must find the terminals to which the battery screwdriver is connected, they have a strict polarity (.).

Now, either try to hook the “crocodiles”, or on one side of the cigarette lighter wire (see the “lighter wire”). above) cut the “crocodiles” and fasten the wire to the terminals (screwdriver plates), safely insulate the connections.

Now it’s all up to your discretion, you can make a hole in the body screwdriver and take out through it wires, you can cut the bottom of the handle in general, it all depends on what we are doing constantly working screwdriver from the car battery, or we need a screwdriver for one-time work.

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The car battery has a more than normal constant voltage when fully charged of a little over 12 volts, which is the same as the voltage draw in the screwdriver, also at 12 volts. That’s why when you connect it in the correct polarity nothing will happen to the screwdriver and it will work just fine with the car battery. This I say from my own experience.

But there are some nuances. The main nuance sits in the battery, which from the motor screwdriver discharges quickly, and the rapid discharge of car battery is very bad for him and as soon as the battery can be just thrown out, so it has to go in a constant charge from a generator or charger, which makes it inconvenient to work with a screwdriver.

I had enough battery for about 1.5 hours of fairly intensive work, then the battery died, but after an hour allowed to drill a few more holes, it was in the cottage when installing the sills on the house with the power off.

When the battery unexpectedly runs out before an important trip, it is not always possible to connect the original charger. If the problem is not solved, you will have to pay for the services of an on-site car service or look for the right gear in the stores. But if you want, you can use improvised means to charge the battery car battery charging electric screwdriver. If you have a battery charger from an old cordless drill, you probably still have it in your garage.


The main factor in choosing an electric screwdriver is power. The higher the value, the longer the tool will work. The product includes 2 batteries (one for operation, the other for charging). For making a home-made battery charger a KT829 transistor is used. Prepare a diagram of the device in advance. To limit the charging current use a resistor with resistance of 1 Ohm.

Through the battery, the charging current is controlled by the transistor KT361. A collector is used to control the charge indicator. 1 element is responsible for the operation of the compound transistor. The charging current depends on the charging time. When making a homemade device, the charge threshold is taken into account. This number should be greater than the value of this indicator when charging at the maximum capacity of the battery.

Specialists recommend using a TP-20-14 transformer for a home-made charger.

It can be dismantled from a black and white TV Electronica-409. The transformer voltage is 9 V and the amperage is 1 A. It is recommended to place the resulting device in a plastic case with suitable parameters.

When using a screwdriver, users are often faced with a damaged battery charger (battery charger). First of all it is connected with instability of parameters of electric network, to which the charger is connected, and secondly. with battery breakdown. This problem can be solved in two ways: by buying a new charger for the screwdriver, or by repairing it yourself.

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

If your battery charger is out of order or lost, you can use it to work with the battery:

The advantage of the battery charger for the car battery is the value of the output voltage. It does not exceed 16,5 Volt, so the charger will be suitable for an electric screwdriver as for 16 Volt as for 18 Volt.

If you have lost the original factory charger, then a universal charger should be used. It has adjustable values of voltage, current and resistance. You may adjust the parameters by yourself according to the manual.

A variety of constant current sources will also work. The main prerequisite is a higher voltage relative to the battery of an electric screwdriver. 10-20% over the rated value is acceptable. Nickel-cadmium and nickel-metal hydride batteries will not tolerate a charging current greater than 0.5 C, while lithium-ion batteries will not exceed 1 C. You have to adjust the current value yourself, also have to monitor the temperature of the battery being charged.

Charging the battery with an external power source

Restoring the battery capacity of a screwdriver battery using a power supply requires knowledge of critical temperatures, input voltage and current settings. If they are not followed, overcharging will occur. The pressure inside the battery will increase, the electrolyte will begin to decompose and may cause a rupture.

Use an external power pack only if there is no other way to charge the battery. It is important to observe terminal polarity and safety precautions. Only hold on to insulated, rubberized wires that do not leak electrical current.

What to do if the battery won’t recharge?

If the battery fails to recharge, it may be because the battery is dead or the battery charger is damaged. Sometimes its terminals and the battery begin to cooperate badly, to fix the problem CS disassemble and bend the contacts.

Sometimes disassembly reveals that the terminals are oxidized or contaminated. To fix the problem, wipe them with a special cleaner or alcohol.

If the capacity of nickel-cadmium batteries has decreased significantly, you can try to overclock them. To do this, they are disassembled, using a multimeter find non-working elements and recharge with a higher current, and then re-discharge. In this way it is possible to partially restore the capacity. Another solution is to disassemble the two battery packs, remove the defective banks and connect the whole ones. After that, the restored device is charged and discharged several times.

What you need to know?

Choosing one of the options that replace the charger of an electric screwdriver, you must remember: the safety of the process will depend on the correct connection of the devices. In addition, it is important to ensure that the charge mode corresponded to the technical characteristics of the battery. Regardless of which charger option is chosen, you need to understand: temporary methods can save the situation several times. But resorting to their use all the time is undesirable, since the correct values of voltage and current produce only the original chargers.

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You can not use chargers with USB-port from a laptop. they are not designed for this. If the battery is not charging, you can try to overcharge the battery. For this the unit must be disassembled and the cause of the fault must be determined. After the unit is charged first with a higher and then a lower current. This allows you to bring it back to life if there is still electrolyte left inside.

To learn how to charge the battery from an electric screwdriver without a charger, see the following video.

It happens all sorts of things, you get behind the wheel, turn the key to start, and instead of a brisk vzh-vzh, just a clack-clack by the retractor and silence, the battery is dead(

Buy a new battery is of course an option, but you need to go here and now. The charger is broken, lying somewhere far away or it is not in the garage at all.

What to do other than to light it or to use the “push-pull” method? All the more, no one to light it (and crocodiles need to find), and with a pusher not all engines perevarut, because it can and cut the belt or chain skip The output is simple, take the screwdriver and. And watch the video!

With a screwdriver (for example, Bosch, as in the photo)

but it is enough to battery built up for half an hour or hour starting capacity, which will allow you to start the car in good condition. To start you will have 2-3 attempts, so the chances are great. And after starting the battery is recharged on a trip from the generator!

I have two chargers, one is not sorry to solder wires

I hook it to the battery without thinking twice, to the first catch. pinches “nicked” from the wife with a clothesline ))))

Then wait for half an hour, put it on the car, start the car for the second time and go on business! After half an hour or an hour of driving, the battery will be fully charged for further use (will start in the morning or in a day)

Step 1: Sacrifice the electric screwdriver!

How many of them there are, standing alone on the shelves at thrift stores or for sale on bulletin boards. Sometimes lifeless, without batteries. Skil, Ryobi, DeWALT, Bosch and others, looking for their new owner. They come in all shapes, sizes, colors. Different power (9.5 volts, 12 volts, 18 volts, 19.2 volts, 28 volts) and battery type (lithium-ion, cadmium, etc.д.). Many of them are obsolete. It was easier for their previous owner to throw away their helper and buy a new one. Thus, these lost children, sitting on the shelves gathering dust, until the salesman at the thrift store, finally throws them away. I’m talking about the electric screwdriver! specifically about the used electric screwdriver.

So, what we need is a 12-volt electric screwdriver, which is not sorry to part with. That’s what I was able to buy for 300. (see.This electric screwdriver had no battery.

USB & Li-ion Upgrading dead Black & Decker Screwdriver. 892

What voltage and current is harmless to charge the car battery

We decided to write this article when we came across a “service center” for battery charging. Chargers were. transformers with diode bridge. Even more disappointing are the advices on the internet: “unscrew the jars before charging”, “find a charger supplying 16V-16.5V”, “achieve good outgassing”, “charge long with low currents”.

We recommend to unscrew the plugs in the battery before charging (if you have them) for owners of Chinese or grandfather’s chargers. These chargers are built with a “transformer plus diode bridge” circuit. voltage can give out any, even 20V. The boiling when charging the electrolyte will probably be such that the case will burst.

Do not charge batteries brought from the cold, let them warm up indoors for a few hours. You must also not charge a battery that is too hot. It is best and safest to charge at room temperature.

Practically useless to charge the battery discharged below 8 volts, most likely one of the cans in it is short-circuited or polarized. Normal charger can not fully charge strongly unbalanced battery: voltage on the current leads will not be higher than 12.5-12.6 volts. Such accumulators may be cured (fully charged) only by specialists. Charge the lagging weak banks separately voltage 2.4 volts current 0,1 capacity of the whole battery in pulsed mode.

IMPORTANT ! Working voltages of a modern battery, below which you MUST NOT discharge 10.8V and above which you MUST NOT charge 14.4 В.

15-16 volt voltage which most of the cheap Chinese chargers charge at. it’s a strong boiling point which destroys the bubbles on the electrodes. The formed sludge does not fall on the bottom, and remains on the plates, held by the envelopes separators. Access of electrolyte to the active mass of the electrodes is partially blocked. Capacity and cold start current drop.

In older battery designs, boiling while charging didn’t have this effect. Sludge has crumbled to the bottom. into its allotted space.

At voltage of 16V of charging, if you do not unscrew the caps of the jars and not let the battery gases escape, the battery just bloats or cracks. At normal charging voltage there is no need to unscrew the caps. Some batteries just don’t have them.

IMPORTANT! Faulty battery can be detected during the charging process. A dead battery is not capable of accepting more than 1 to 2 amperes of current. A battery that has died of severe sulphation can be seen by the following: even at low charging currents the voltage immediately rises to a maximum of 14.4 volts. By the battery voltage (12.7-13 V) it looks like it is fully charged. Worthlessness is shown by the test with a load fork or the car starter. the voltage on the terminals immediately drops, the engine does not start. This sulphation is likely irreversible and the battery should be scrapped.

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IMPORTANT! Do not charge with a current greater than 1/10th of the capacity and a current less than 1/20th of the capacity is useless. For the standard 60 Ah batteries the normal charging currents are from 3A to 6A (7-9 Ampere in the “current feed pause” charging mode). In a battery, the charging current triggers chemical reactions. The reactions depend on the amount of active mass on the plates and its thickness, the area of the electrodes, the temperature range, the undesirable process of electrolysis of water. The weak current will not charge the entire bulk of the electrode, but only the uppermost layer. After this the voltage will rise to 14V or more signaling the end of the charge. The electrolysis of the water will begin. Continuing to charge such a battery at a low current is unacceptable as passivation of the electrodes will occur. plates will lose their ability to accept normal charging currents at all. If the charging current in the battery is too high, unwanted chemical reactions will occur, which in addition will proceed too violently and destructively. If the charging current is too high for the particular battery, then because of the “extra current” there will be a profuse release of hydrogen and oxygen from the electrolyte. boiling, “gurgling” in the cans. The bubbles are destroying the layer of the fillings, and free oxygen is oxidizing the lead in the positive plates, turning them into soft lead oxide, easily destroyed by vibration, “spongy lead”. In an operating battery, when you stop the current flow. the boiling should immediately stop.

It is also harmful to store the battery at a constant low current charge. If you charge an already charged battery. The positive plates will oxidize and “boil off” the water from the electrolyte. The result will be a battery with corroding electrodes, loose jumpers, and high self-discharge.

The process of charging the battery should be monitored visually, making sure that the electrolyte is not “boiling”, which usually happens at voltages above 14.4V; and with a multimeter, measuring the voltage and current of the charge. Cheap antimony batteries always boil. Also there will be bubbles when charging a sulfated battery. a weak charger (1-2 Ampere current) will not charge even a 60 Ah battery. It will definitely raise the NRT of the battery to 12.7V, but it will add a lot of health problems to the battery. In case of more powerful chargers there is a problem of “excessive current” and rapidly growing voltage, leading to destructive for the battery electrolysis of water. It’s optimal to charge the battery even with “grandfather’s” charger plugged into the socket with the help of the timer in the drip charging mode: after a short period of current supply (10-30 sec) turn the charger off for a while (10 sec), then on again and then off again. Most of the rules for charging a battery are followed this way. The charge is carried by a strong current, the voltage does not rise prematurely, at the moment of disconnection of the charger the battery “absorbs” the chemical processes of the charge received, the voltage does not rise too quickly, the process of “boiling” of water does not occur. You can either connect the charger through an electronic on/off timer for the socket, or you can charge it through a home made multivibrator “blinker. The simplest blinker is made from a turn signal relay. Schematics are on the internet. Time of switching on and off is adjusted by experience, based on the characteristics of the charger and the battery.

It is best to charge the battery with a modern “smart” charger that has “brains” inside. processor. Such a charger is capable of selecting currents and voltages of charge and can monitor them.

Find out when to charge your battery

A 12 volt car battery is charged when its voltage and amperage readings have not changed for 2 hours. For proper operation, it is sufficient to maintain the parameters for 1 hour. This is normally at 16.3(±0.1) volts.

Charging Lithium Polymer Batteries

Lipo 3.8 V batteries can be charged with the devices that come with them or with chargers such as the Imax B6.

Batteries are charged at 20 to 100% of their rated capacity. Lower voltages are preferable for rechargeable batteries. The main question is what voltage a charged battery shows? Once 70-80% is reached, charging begins at a constant voltage and decreasing current.

Special devices for Lipo 3.8 V signal the end of charging when 70-80% of capacity is reached. Further increasing the density will result in less frequent charges, but will reduce the life of the battery overall.

When charging Lithium Polymer batteries at 3.8 volts the charger should read 4.2 volts. If you can set it to 4.1 volts, it will take a little longer to charge, but the battery will last much longer.

When needed?

There are situations where an electric screwdriver charger is not available. For example, it can fail, which may cause the operation to stop. In addition, the charger can be lost. The third reason is elementary burnout and wear and tear of the battery charger, as well as unbent terminals in the battery itself, which causes loss of contact. To eliminate the problem, you have to look for the right options for charging that will be compatible with the model of electric screwdriver you have. In this case, it is preferable to buy the right charger, which will promote safe operation and fully charge the battery of the tool.

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