How to rebuild a 12 volt electric screwdriver battery

Power supply for a 12v electric screwdriver with your own hands

Screwdrivers with self-contained 12V battery power are a highly sought-after tool on production lines and at household level. Its advantage is considered to be unrelated to the mains socket, the work of drilling and fixing screws is very convenient. The disadvantage is the high cost of rechargeable batteries and their relatively short life. from 3-5 years, with intensive work can be even less. Therefore, many people wonder how to make a power supply for an electric screwdriver with their own hands. When buying and replacing batteries, the financial cost can be 50 to 80% of the original cost of a new electric screwdriver. Considering their financial capabilities and needs, many consumers are looking for a more economical way to continue using old screwdrivers. One such way is to modify its power circuitry for a 220-volt outlet.

rebuild, volt, electric, screwdriver, battery

How to convert a 12 and 18 volt cordless electric screwdriver into a cordless screwdriver with your own hands

The cordless electric screwdriver was designed primarily for mobility. It is much more convenient to work with the tool without thinking about whether the wire is long enough, whether it gets caught, etc. д.

But without batteries, such a handy tool as an electric screwdriver becomes a simple piece of hardware, although it is fully functional. Battery life is about 3 years, and it is often impossible to find complete or similar batteries on sale. For example, the manufacturer has already stopped producing such a model, and other batteries are not suitable for various parameters.

It is a shame to throw away a tool that you have once paid money for, sometimes quite a lot of money. Besides, the cost of batteries is often up to 80% of the price of an electric screwdriver, and it is more reasonable to buy a new tool. Old tools tend to get sent to a junk drawer and lie there uselessly. But there is a way to get it back to work. to convert it to power from a 220 volt electric network.

How to convert the electric screwdriver to lithium batteries

Most older models of cordless screwdrivers were equipped with NiCd batteries. As everyone knows, these batteries do not stand out with great power, moreover, they have a memory effect, which significantly reduces the amount of capacity. Therefore, many owners of such equipment are taking on the conversion of screwdrivers to lithium batteries 12V 18650. The process is time consuming, but if you follow the steps, the result will be a success.

Choosing a battery assembly diagram by capacity, voltage, and available space

Depending on the voltage required for power, determine how many batteries 18650 for an electric screwdriver should be connected in series. The dependence of the number of batteries on the voltage:

If space allows, you can connect an equal amount of batteries in parallel to the existing ones to double the capacity.

There are special holders to keep the batteries securely in place. They will protect the cans from vibrations during the operation of the electric screwdriver.

How do you connect an electric screwdriver to a car battery?

What is the best way to do it?? Isn’t it dangerous for the electric screwdriver?

Т.к. The work of an electric screwdriver is connected with jolts of voltage when turning on and off, the car battery is the best fit, because the normal mode of operation of the latter is associated exactly with the discharge-discharge mode. As for the damage to the device itself (screwdriver). There is no reason to be concerned. it will draw as much as it needs to. Although for the good work of an electric screwdriver from a car battery, its operating voltage must be in the region of 12 V.

Connect the electric screwdriver to the battery by means of a flexible copper cable to the plus/minus terminals on the device and the battery respectively.

You can connect the screwdriver to the car battery if they have the same voltage, namely the screwdriver will be marked 12 V (there are plenty of them on sale)!), in which case you can simply connect it with a temporary cable and work without fear.

But a large number of wrenches have a higher voltage of 14V and 18V. in this case, for stable and high-quality work of the screwdriver should use a rectifier with regulation of voltage increase, otherwise the screwdriver will be crushed because of the weak power, and the battery amperage will heat it. which may lead to the breakdown of the electric device.

often we deal with wrenches for 12-14 volt. This is the most optimal voltage and is therefore quite suitable for connecting an electric screwdriver to a car battery. The main thing here is not to reverse the polarity plus and minus. Even if your electric screwdriver is 18 volts, no problem. You can plug it in too, just a little less power. But that’s okay, it’s an electric screwdriver, not a speed drill. This electric screwdriver will do its job properly.

If the screwdriver is designed for 12 volts then you can connect it to the car battery and not only.The battery from an uninterruptible power supply is also designed for 12 volts.The main thing is not to mix up the plus and minus terminals screwdriver connection.To prevent the screwdriver from being switched on incorrectly, you could try putting a diode in the middle of one lead.It just theoretically should help against improper switching.

I threw the calculation in excel (file attached) on the issue of voltage drop depending on the cross section of the wire and load well if some educated person look and confirm or tell you what to fix, will connect the screwdrivers to car batteries methodical material good. Thanks to Alexander IV for the idea. the wire from the battery to the screwdriver I counted as 2 long (to it from it) correct, no?Later added by the author:

I am interested in the meaning of this manipulation?? cordless tool is more expensive and we pay extra for the convenience of no cord. Besides the battery will also have to be serviced.

1) money and undiscovered creative engineering potential that you want to manifest. a used electric screwdriver without a battery with a dead battery can be bought for small money or just given as a gift, you can buy a new one from the same Makita without a battery cheaper. 2) the convenience of using an electric screwdriver, which has a screwdriver from the bottom is also a very relative phenomenon in the first place without battery electric screwdriver is lighter and more compact, and a small electric screwdriver 10,8 v which I started talking about in general a baby, I’m not confused about the wire and I’m ready to have a light tool on the wire. Secondly, I have seen many times how installers in winter (in our region of Siberia).20-30) suffer with these cordless screwdrivers, I do not know what they like to run every 15 minutes to recharge the battery, I never understood why they do not solve the problem for themselves. 3) Regarding the fact that you need a car battery, a car enthusiast usually has a decent amount of them on which the winter will not be able to go, and throw out or give it away for 300 rubles as boilers sorry. Amps of 10 or even 20 can easily fit in there, and that’s a few days of work, if not a week.

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I would rather think about the topic of connecting a power tool to a battery.

Repair Cordless Drill |Inside Drill Machine

the idea is certainly interesting, but there are objective laws of physics and there are actually ready-made solutions. The laws of physics dictate that not much can fit in the battery, and a regular powerful electric tool consumes a lot.

my wife is just an inverter with appropriate capacity, it has its own problems, but it’s easy to buy even at a decent cost and a lot of batteries and there are their own problems with the number of full cycles of discharge and it is important that a used car for free will not work you have to get a new one for a decent price. So it turns out that the question is whether you are willing to pay a lot of money for a few hours of power tools from batteries. again there are already ready solutions from manufacturers which as well as they should be decently more expensive. Although I have an 800W inverter, the simplest Chinese one, it is quite capable of pulling a regular cordless drill of appropriate power. Later: checked with this Chinese inverter 800w drill 650w grinder 350w jigsaw 450w they worked a little, all is fine so that the problem of power from the battery power tool in general is not, except that in the 60Ah new car battery can hold somewhere 800w and that will lead to its complete discharge is undesirable.Later added by the author:

By the way, I wonder why all battery tool manufacturers have these batteries are sold as a whole. no one has any chucks for them. have to look for them at the market!

The ideal consumer for corporations is a person who has no idea how the product works and follows the manufacturer’s exact instructions to replace the consumables in due time with genuine ones.

Installed the kit in a Bosch GSR 12. Works great.

Hello, Ivan. I came to you in the winter to redo the battery.-. I’m very pleased. I want to redo the second one, too. But the second аккум, I forgot on the site for 100 km and not really want to go there. Can I buy a case for the battery from you?

Hello, unfortunately the case for Hitachi ended, in the presence of only kits for self-installation

Good evening. I ordered a 12v kit. Here it is. Installed it all works fine. Thank you!

Can you tell me for Hyundai A1422 expert

How to make Cordless Drill Battery? Drill Repair Urdu/Hindi

Good afternoon, now you can order kits?

Need for DeWALT DC 727 KA 2pcs Bosch PSR1200 1pcs

Good afternoon! At 10-12 V for May 5 no kits?

advise which kit to take for a Makita 6337

Hello. For Hitachi 12v 2.0 Ah what assembly to take?

Hello, For Hitachi 12V cells can be supplied with a capacity of 2.5Ah

790554441456 (verified by the owner) 31.05.2020

Ordering received, all promptly in the 7 days stated. The time of use will show the quality, but so far no complaints! After assembling the battery case, put it on charge, charging for over an hour, red light did not go out, but the charger heated up noticeably.

Battery charging time is about 1.20-1.50min

batteries for six months, flying normal! Borrowed from Bosch 12 V directly in the case!

Thank you order, leave a review on Yandex for all

So how much is the board with three 1430 OR 2090 needs for Bosch PSR1200 12 volt

Kirill (verified owner) 15.03.2021

I have a Makita 6271. Ancient but unbreakable screwdriver. Batteries kept the charge on a couple of self-tapping screws. Ordered this kit to convert to lithium (2.5Ah) and installed in the body of the original battery. Never recognize the screwdriver! The battery life is phenomenal, the battery charge time is about 1.5 hours. Charged it once after assembly in July 2020. Since then assembled 4 racks of metal at the cottage, screwed a bunch of screws there, at home a lot of things drilled and twisted. At the moment the battery has 20% of charge (on the indicator). The only nuance in the availability of better to order in this store ready battery, t.к. I had a lot of trouble shoving the assembly into the body of the native battery. Building on a summer house is coming, I will order the second battery, ready-made. Thanks to the site and the person who came up with the idea to sell ready assemblies!

Thank you, it’s nice to read a detailed review)

Greetings Could you please tell me when there will appear on sale ready-made kit installed in the battery case of an electric screwdriver with a voltage of 9-12V. For Bosch and Hitachi

Hello, we are expecting delivery of components for June 5-10, 2021. The availability of kits on the site will specify!

Switching the screwdriver to lithium batteries (from Ni-Cd to Li-Ion)

The inevitable had come. the batteries in my old Hitachi DS 12DVF3 had finally died. They began to hold a charge disgustingly long ago, but for small household needs the available capacity was enough, so I never thought about solving this problem. To the moment I needed to drill a hole in a stainless steel kitchen sink, which took me about forty minutes! For one hole! One battery couldn’t rock at all, and the other one worked like that, twenty seconds it spins, about ten minutes it charges. That’s when I realized that it’s time to give a new life to my favorite tool.It is clear that to begin with I needed to know a bit of theory to understand what I was going to do. Of course, this topic is not new and everybody is busy converting screwdrivers to lithium. But everyone does it in his own way, depending on his education, amount of laziness and notion of beauty. I had to make sure that everything was technically correct, that it didn’t look scary on the outside and that the batteries were easy to use. After reading and reviewing a lot of material I used AlexGyver’s project.

Determined the necessary elements, I went to Ali to spend money. I ordered the lithium batteries with the nickel plates already welded on, so as not to torture myself or them with soldering. It turned out that the delivery of batteries really takes a long time, and while I was waiting for one from China, I bought another one at a local store, but without plates, because I have two carcasses for remaking. A month and a half after the order I finally received my parcels and could already start working. Firstly I disassemble one old case and look inside it.

Here you need to carefully break off the upper contact strip, it will be needed later. I also need nickel jumpers to solder the batteries of the second block, so I put this junk aside for now. Further I am trying on new components in order to understand the front of forthcoming works.

While getting ready I checked one VariCore battery against its specifications, since you can expect all sorts of things from the Chinese. Imagine my surprise when the final battery capacity was 2,892 mAh instead of 3,000 mAh! That’s a great result considering all the possible pitfalls!

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There was not enough space for three 18650 banks and BMS board in the standard battery case, so I decided to get rid of the latch and remove all the unnecessary plastic elements from the inside.

As it turned out later, the decision was correct. The case holds up perfectly even without the lock because of the very strong spring-loaded clamping plates inside the screwdriver itself, and the new battery itself becomes somewhat lighter than the old nickel-cadmium battery. I saw on youtube a variant of placing lithium dummies and the same BMS board without removing the latch, but I didn’t like how it looked and gave up on this layout. But in my case, simply getting rid of the ribs inside the case was not enough, the width of three 18650 cans still do not fit, I had to grind a little fixing guides self-tapping.

Without indicator of the remaining charge it would be quite depressing and outdated, so I take a voltmeter and solder to it a tact button with an elongated sting (13 mm)

I use a file and a sharp knife to make a place in the enclosure for it, and not too accurately, but very reliably glue it on the “hot snot”.

Such a pretty muzzle appears

After all this dabbling begins the most responsible stage. the assembly of the power unit 🙂 If you have a lithium cans welded electrodes, this case is not very difficult.

As always at the top of the line showed flux Amtech NC-559, or rather its excellent Chinese copy.

Many say that the battery without acid can not solder. Soldering acid, I also have, but I decided to try my favorite flux in a new environment for him, and even here it worked fine. The only thing I had to scrape the pad with a knife, otherwise the solder wouldn’t fit very well and it could lead to a catastrophic overheating of the lithium jar.It turned out such a neat assembly, on which I pasted two strips of double sided adhesive tape for fixing the BMS board.

At the same place where I got the lithium batteries, I bought a thick power wire in a silicone insulator. It’s not cheap, but I really wanted power and flexibility, so I didn’t skimp on it.I was very impatient to solder the bottom of the board with the voltmeter and started testing the half-finished product 🙂

The voltmeter was surprisingly accurate, I didn’t even need to calibrate it.So the two parts of the future rechargeable battery are connected, the only thing left is to prepare the last third for mounting.Carefully I attached the broken off pins to the pad with some five minutes of “epoxy”. Probably did not make much sense to do so, because the contacts will be clamped by a self-tapping screw in the final assembly, but I would be more relaxed this way.

After drying, drilling holes. I used a 2mm drill bit in the contact area and a 3mm bit in the cover, followed by countersinking with a 6mm bit to make the screw head flush with the surface.

The last steps before the final assembly are very important. You need to insulate everything as much as possible and neatly lay all the wires.

When everything has been double-checked a hundred times, you can twist.

Tried a new battery in operation. Awesome! It turns pretty fast, it holds the torque, the ratchet works fine in the penultimate graduation. What more could you ask for??! Unless you have a second one like it! Made it as they say “by hot steps” or “without leaving the cash register” or “make the iron” and so on, until all the tools have been removed. The process is, of course, exactly the same, except for joining the jars into an assembly. It just needed the nickel plates from old batteries, because the second set of cans I have without welded electrodes. I did not make a photo, worked hard, but the process is simple, only requires increased accuracy and 440 ° C on the soldering station.

You may notice a slightly different display-voltmeter here. It’s specifically designed to work with a 3S balancing board, that is, it will show the maximum charge (four bars) when it reaches 12.1V, three divisions at 11.4V, two at 10.9B, one at 10.3В. It is not recommended to discharge a lithium assembly of three 18650s any more and it will simply extinguish all the bars and only the red frame will remain lit. Very interesting display.The old charger is not suitable for lithium work, so I ordered a new one in China, with suitable parameters. It has a LED on the top cover that lights red when the battery is charging and green when the battery is charged.

This charger has a very specific feature. It beeps when charging! 🙂 In the reviews, many people write that this is some kind of disorder, but it seems fine to me. At night when I sleep I do not plan to use it, but in other conditions, you always know if there is no beep, it means the battery is charged!

That’s all. I learned a lot again, gained experience building lithium assemblies and mastered the principles of working with a soldering station at extreme temperatures.Many, looking at the budget for the work done, would say that for this money could buy in China, a good new screwdriver with the correct power supply. Absolutely agree with them. However, I really enjoyed the work and gained invaluable experience, and this is more important than the banal purchase of new items. over, it is incredibly easy in the hand, well, and dear to me as a memory!

Budget:Voltmeter 0,28″. 58p. LinkDisplay-voltmeter. 67p. LinkCharger. 395r. linkPower connector BC099 (5,52,1). 2pcs.40р.=80р. linkBMS 3S board. 2pc.117р.=234р. LinkBattery VariCore 18650 3000mAh 30A. 3 pcs.215р.=645р. LinkBattery LG HE4 18650 2500mAh 25A. 3 pcs.280р.=840р. LinkWire 16AWG 1 meter. 2pcs.75р.=150р. LinkTactical button KFC-A06-13H. 2 pcs.3,20р.=6,4р. linkTotal for two batteries: 2475.4p.

Adaptation of a screwdriver power supply to work from the mains

Irreplaceable assistant in the work is a screwdriver. Its application is effective not only in the household, but also in professional activities. Nowadays, it is difficult to imagine carrying out repair and finishing work without this versatile power tool. The screwdriver can work anywhere, regardless of the availability of mains power. But power tools rechargeable battery (battery) tends to discharge, and the number of charge cycles is limited. On average, the battery lasts about three years, and then you have to replace it, so folk craftsmen began to remake the power supply to the mains version.

Rebuilding an electric screwdriver with your own hands

Consider a remote power supply.

Using a personal computer power supply

At flea markets for a small fee you can buy an old power supply from a personal computer. Need the “AT” format variant, which had to be switched off with the key after logging out of the operating system.

Older users will remember these units. Another advantage of such a PSU is that it has an honest power rating. If it says 300W. then you can safely take 15-16 amps from the 12-volt output (again we refer to Ohm’s law). This is good enough to power an average electric screwdriver.

These units include a power button. Another advantage is the cooling fan and the advanced overload protection system.

If you will be hiding the power supply in a nice case. do not forget to leave a hole for ventilation.

The connection is very simple. Black wire (-), yellow wire (12V).

Limitations. an electric screwdriver with a supply voltage higher than 14 volts, will not work.

Using a car battery charger

The principle is the same as that of a computer power supply. It is necessary to buy an old charging block for starter batteries. The current fashion for compact pulse chargers has left the analog, linear units with manual voltage and current regulation out of the equation. Therefore, you can buy such a device at the car market for a nominal cost.

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It is good, if you can regulate the voltage smoothly. in this case, your improvised power supply will fit any screwdriver.

Converting it into a power tool is just a matter of connecting the input of the electric motor to the power terminals of the charger.

Making a homemade power supply

If you are familiar with the principles of constructing electric circuits, you can make your own power supply. A schematic giving the general concepts is in the picture.

The transformer can be from an old tube TV, or other household appliances. Power output at 220 volts 250-350W. The main thing is the power supply. the donor must not be a pulsed.

The secondary voltage of 24-30 volts. The secondary winding is made of a wire with a corresponding cross section.

However, if the current of the output winding is at least 15 amperes (see “Output current” on page 54). transformer specification). nothing to worry about.

After losses at the diode bridge (1-1,5 V at the diode) you get the required value at the output.

If you have electrical education. make the calculation yourself. Or in practical way: connect incandescent light bulb 220 volt 100W as a load, measure the voltage at the output. Е

If it exceeds the needs of an electric screwdriver. reduce the number of turns of the secondary of the transformer.

Step 2: Disassembly

Start by removing the obvious screws that hold the body of the electric screwdriver together. I had Torx T10s screws, you will probably have the same. For the most part, they are all twisted easily.

No matter what brand of power tool. Bosch, Interskol, Makita, Hitachi, etc. д., they all function on the same principle. Energy is stored in the cell, which gives it away when using an electric screwdriver. The battery life depends on the type of battery. Today there are 3 main variants, each with its own advantages and disadvantages.

Li-ion batteries

The most advanced solution today, which works consistently over a wide temperature range. And if the equipment is just lying around, the self-discharge per year doesn’t exceed 20 percent, which is also very important. The main advantages are as follows:

  • The ability to charge quickly without damaging the equipment.
  • Lithium ion batteries have high capacity with low weight.
  • There is no memory effect, so you can charge the battery as needed.
  • The system provides high fire safety, also there is protection against overcharging.
  • The highest energy capacity.
  • Battery life is reduced in the cold.
  • The price of lithium-ion batteries is much higher.
  • Service life of 2 to 5 years.
  • Each battery model requires its own battery charger.

By the way!

This solution is ideal for those who use the tool constantly.

Nickel-metal hydride batteries

In this variety the quality of the alloys used is of primary importance, so each manufacturer has its own specific manufacturing technology. The option can be called the golden mean, since it does not contain toxic cadmium and has many advantages, among which the main ones are the following

  • Affordable cost.
  • The memory effect is present, but not very great.
  • With a small weight and size the capacity is quite impressive.
  • Good working parameters at operation in the permissible temperature range.
  • Fairly high self-discharge rates.
  • Battery capacity decreases after 200-300 recharge cycles.
  • Heat dissipation during charging.
  • Batteries do not function at temperatures above 40°C or below.10°C.

By the way!

At full discharge battery capacity drops and it is not possible to restore it to its original parameters, so you must constantly monitor the charge.

Nickel-cadmium batteries

The least expensive option, which was most common a few decades ago. Simply put, these are traditional alkaline batteries, which have these advantages:

  • Low cost.
  • Fast charging process.
  • Stable energy output at temperatures up to.20°C.
  • Up to 100 charge-discharge cycles.
  • Long shelf life.

BOSCH Upgrade Battery / Change Old Dead Li Ion Cell / GSR BAT411

There are some disadvantages to be sorted out:

  • High self-discharge during storage. After a long period of non-operation it is necessary to carry out a recovery process.
  • Cadmium toxicity.
  • If the batteries are deeply discharged, they suffer irreversible damage.

By the way!

If you use an electric screwdriver every day, you can choose this solution as the most budget-friendly.

How to Connect an Electric Screwdriver to a Car Battery

Inexpensive screwdrivers for those who do not use the tool very often are good. But, as practice shows, for the time being. Most of them have batteries that fail quite quickly, and sometimes they simply do not have enough power. To solve this issue will help a simple variant of the modification of the tool. At the output you will get an electric screwdriver, which will work directly from the car battery.

You can order the battery for the gyroscooter. Then connect your electric screwdriver to it.

To modify an electric screwdriver with your own hands, prepare:

  • Electric screwdriver itself;
  • A long Phillips screwdriver;
  • file;
  • Clips for the battery with wires;
  • wire cutters;
  • knife;
  • soldering iron;
  • solder;
  • duct tape.

Before you begin, you must completely disassemble the tool. Use a long thin screwdriver for this.

First remove one half of the housing, and leave the other half with its internal contents in its original form. Remove the battery from the housing. Your electric screwdriver may look a little different on the inside. Here already everything depends on the producer. Be sure to find the positive and negative electrodes. These will be needed for further work.

Note the location of all the internal parts of the tool and carefully remove them from the housing.

Use a file to safely cut off the bottom of the plastic housing, which acts as a support. In a modified electric screwdriver, this part will be superfluous. Try to cut parts symmetrically on both halves of the tool.

Strip the wire ends on the battery clamps. Use a sharp knife for this. If your wires are too long, cut off the extra wire with wire cutters and only then strip it.

Connect the wires to the electrodes. In this case the construction was a bit unusual, so it was enough to put the wires in the clamps and fasten them with electrical tape. In most cases you will need to use a soldering iron and solder to connect it. Be prepared for this beforehand.

Reassemble the electric screwdriver. Insert the inner contents, wire with clips to the outside. Assemble the case and fasten it with screws. At the bottom, where the stand was, secure everything with duct tape and cover the hole that is created with it.

The end result is a greatly improved electric screwdriver that performs better than before. That way you can use it when you are on the road or far from where you can charge the battery of the tool itself.

How to connect an electric screwdriver to a car battery

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