How To Disassemble The Battery Of A Makita Screwdriver

How to correctly and quickly disassemble the battery of a Makita screwdriver

Greetings, my dear readers.

I hasten to share with you two interesting news that have changed my way of life that has developed over the years:

1. December 16, 2015 my son was born. Yaroslav :))) Now I have a daughter and two sons, Honey. 2. Shortly before the birth of his son, a terrible thing happened. the battery on the Makita screwdriver "died", which had been plowing with faith and truth for almost five years 🙁

Of course, the first event is much more important for me, but I will introduce you to it in the next article of my blog 🙂

But the news that the battery of the screwdriver came to an end not sickly so undermined my already shaken health, since the "deceased" was immediately buried and a certain amount of AL-KOgol was consumed for the repose of his 14-volt soul. Yes, Megavolt will be with him.

Of course, for all the years of his construction and repair career, your humble servant "shook" a huge number of screwdrivers, but Makita was a real godsend for me. Its ergomics, its reliability. I was captivated by it at first sight!

In general, I could not come to terms with the loss and decided by all means to repair the screwdriver battery.

After reading a huge amount of literature, graduating with honors from the courses "Novice Warlock". the department of applied necromancy, that is, the revival of the dead. I got down to work, but from the first steps I realized that in order to restore the screwdriver’s battery it was necessary to disassemble it.

How to disassemble the battery of a screwdriver yourself?

We take the battery and begin to carefully cut it with an ordinary, but very sharp knife at the junction in the battery.

How To Disassemble The Battery Of A Makita Screwdriver

Then, in order to tear off the layer of glue located lower, I scrolled along the entire length with a self-tapping screw. This must be done carefully, because the body may crack and then you will have to get a haircut as a monk 🙂

When you feel that the battery began to "crackle", you need to start tapping the joint with a flat screwdriver

So, my dear hands, I independently disassembled the battery of the Makita screwdriver. Of course, my method is not a panacea, but I know for sure that it works 🙂

How to disassemble a screwdriver battery?

So, the first step is to take the battery and place it on a hard surface. Personally, the kitchen table came up to me, besides, in parallel with disassembling the battery, you can “grind off” something tasty.

Batteries on screwdrivers are collapsible, but they are not collapsible. It is clear that it is more profitable for the manufacturer to make non-collapsible ones, since the failure of the battery automatically implies the purchase of a new battery, only there is one small "НННООО"!

The thing is that the price of a new rechargeable battery for Shurik reaches up to a third of the cost of the screwdriver itself! Therefore, as a true Patriot of our country and a level 80 handshake, I didn’t even have the thought of buying a new battery or some fucking Chinese analogue (sorry for my French).

An immediate decision was made. I will disassemble the battery of the screwdriver with my own hands.

Dismantling the battery of a Makita screwdriver.

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How to disassemble a battery using a regular mallet

In order to disassemble the battery from a Bosch screwdriver, Metabo or any other tool of 12 volts or more, you need to make some effort. If you just rip open the adjacent edges of the battery pack with a screwdriver, it will be messy. In addition, there is a greater risk that the fragile plastic structure will simply break.

Therefore, it is recommended to take a mallet and begin to slowly tap on the edge of the seam until characteristic sounds appear, meaning that the seam itself begins to weaken on the sly. It will take a long time to knock, and it will take time and patience. But it is in this way that you can ensure that the disassembly of the battery from the Makita screwdriver will be crowned with success, without unnecessary breakdowns and losses.

After a while, you will hear a crack of a breaking seam. The batteries themselves inside from such manipulations will not be damaged. Only the seam holding the block will break, and the "cans" and the two halves of the plastic case will remain unharmed.

When we disassemble the unit, knock the body with a mallet lightly, without applying any special efforts, so that it bounces slightly off the surface. From time to time, between tapping, you can try to slowly pull back the bottom cover of the block, thereby checking how much the seam has loosened. In such cases, the mallet itself will be slightly damaged, but there is nothing wrong with that.

It should be warned right away that the battery packs of the 12-volt Makita screwdriver are often extremely sturdy and difficult to disassemble. But if you slowly work with a mallet, the seam on the glue will gradually crumble. This may take ten minutes or more in time. But for a person with experience, the whole process takes no more than six minutes.

This is how, gradually and accurately, you can disassemble the screwdriver battery, which the manufacturer intentionally made "non-removable". with the aim not to change the batteries in it, but immediately run after a new one, which is expensive. Of course, this will require a certain skill and accuracy. But it will also save money, and at the same time learn how to disassemble the battery from the Makita screwdriver with your own hands.

How to disassemble and remake a battery from a screwdriver with your own hands

Everyone knows that the battery of a screwdriver sooner or later begins to lose its former performance and needs to be replaced. Usually only a couple of elements in a common bundle "sit down", but this negatively affects the entire battery. Therefore, it becomes necessary to either replace several elements with new ones, or still change the battery pack completely. Since the complete set of any screwdriver. "Hitachi", "Makita" and other models. includes two batteries, if you wish, you can try to assemble a whole homemade battery from two. The owners of power tools, who use them constantly, sooner or later begin to wonder how to convert the battery of a screwdriver to lithium. As for the newcomers who were first puzzled by this goal, they first of all have a question about how to disassemble the battery from the Makita screwdriver or any other, so as not to damage the fragile plastic box.

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Experienced electronics enthusiasts assemble different types of batteries, including power supplies for an uninterruptible power supply (UPS). This is much more difficult than disassembling an electric drill battery. Any drill is often produced with the so-called "non-separable" battery packs, which are either firmly sealed with tape around the perimeter, or their two parts fit so tightly to each other that, at first glance, it is impossible to disconnect them without causing forced external damage. However, among folk craftsmen you can also find people who have already thoroughly "got their hands on" with such batteries and can happily share secrets with everyone.

How to assemble one battery from two

It so happens that the best way out of the situation when both batteries are "hooked" is a way to assemble one full battery of two. Using any of the proposed methods, you can disassemble both blocks in order to understand which elements are suitable for further use, and which should be discarded.

For this you will need:

  • Two batteries,
  • Charger,
  • Any thin and flat screwdriver,
  • Scalpel,
  • A piece of sandpaper,
  • Two wires,
  • Load resistance (two are possible),
  • Voltmeter for voltage measurements.

What is the load for?

Let’s work with the load resistance. As already mentioned, you can take two, each with a nominal value of 1 ohm. If we put both of them in parallel, then the total resistance we get 0.5 Ohm. It is not necessary to adhere to these ratings, but the lower the resistance, the better.

What is the role of load resistors in qualitatively replacing the battery pack? If we take any electrical appliance and measure the voltage in its battery, we get a certain value. However, this value does not show how well a particular battery can give its energy. If we measure the voltage under load, we will have what is called "voltage drop". It is just from it that you can judge how good or bad the battery is.

The load resistance in the form of two small metal blanks and wires, connected in parallel to each other, is carefully connected to a voltmeter. This loading method is acceptable only if the output voltage of your battery is 12 volts or less (safe voltage level).

The wiring is neatly fixed in the "sockets" of the voltmeter with probes, and a constant voltage threshold of 20 volts is set on the voltmeter. This indicator is quite enough to measure U for the entire bunch of elements as a whole and for each element separately, which is especially important.

We measure the voltage

Before measuring the voltage of the cells, prepare a simple pencil with which you will write down the value of U issued by each battery in a bundle. Since in most cases "running" screwdrivers are equipped with nickel-cadmium batteries packed in dense cardboard layers, it is important to ensure that the batteries are accessible from both sides.

Now it remains to turn on the voltmeter (or multimeter) and start measuring. When measuring, we make each battery an exposure for five seconds and see if the voltage drops (usually it is normally about 1.2 volts for each battery separately). We fix the indicators with a pencil. It is impossible to keep the probes on batteries for a long time, because the resistance increases, and they can simply burn out.

Practice shows that if only one element of the entire bundle fails, this negatively affects the operation of all batteries. If the voltage indicator on any "bank" is 1 volt or less, it has already exhausted its resource. In order to finally make sure of this, you should check the self-discharge level of each battery in the bundle.

After the unusable elements are "calculated", we disconnect them from the rest with a scalpel, and in their place we put usable batteries from a spare battery. So we redo the whole block, collecting one full-fledged from two.

Charging the batteries

Before disassembling the blocks, be sure to charge them well. With subsequent voltage measurements, this is exactly what will make it possible to understand which batteries are "live" and which are not. Before charging the batteries, it is recommended to clean the internal contacts of the charger with emery paper, because any contact resistance can "give out" an incorrect charging process.

When you charge both batteries alternately, pay attention to how fast they charge. If the battery is charged quickly, and the charge indicator signals the end of the process after just a few minutes, this means that there are definitely faulty cells in the battery. And of course, when the battery is charging too slowly, or does not take current at all, it should definitely be disassembled and "tested" all the batteries that are inside. Read more about the charging time of the screwdriver battery →

After you charge and disassemble your battery pack, you will see that there are several elements inside it. cans. The number may vary, depending on the voltage level of your instrument. Banks are connected in a certain series. Inside there is a thermal sensor brought out to the contact plates.

How a screwdriver works?

What problems can be fixed at home? How to recognize this or that breakdown? To give specific answers to the questions asked, let’s first understand the internal mechanism of the tool. The main protruding element is the power button. Used to start the device and to change the speed, direction of rotation of the working part. the chuck.

The setting of the revolutions is carried out thanks to an electronic device based on a transistor. The speed of rotation is directly proportional to the force at which the button is pressed. The reverse is started by replacing the polarity of the electric current at the terminals. Traditionally, the screwdriver is equipped with single-phase collector-type motors that operate on continuous current. The motor includes a housing, magnets, anchor and brushes.

Rotation from the motor goes to the gearbox. Further, it converts high engine speeds into reduced cycles on the shaft, a cartridge with active bits is fixed in it. The gearbox can be used classical, as on a conventional drill, including planetary. Recently, the classic gearbox is almost never used, so we will not stop and go further. The planetary gear includes:

  • Ring gear
  • Sun gear mounted directly on the motor shaft
  • Satellites
  • Two or three carriers
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Then comes the force stabilizer, which has sixteen positions. These positions give a specific voltage to the screw, so as not to spoil the material with which they are attached. The last component is the cartridge.

How to disassemble a screwdriver: cartridge, battery

Innovative technologies in construction are developing every day, it has long been no secret that a screwdriver is an indispensable assistant for both an experienced specialist and a novice craftsman. Thanks to him, you can easily tighten all kinds of screws and self-tapping screws when assembling furniture structures, as well as when repairing equipment and living quarters.

  • How to remove a chuck from a screwdriver
  • How to revive a screwdriver battery
  • Repair of the gearbox and screwdriver button
  • How to change the chuck for a drill

The fact that any equipment fails over time is no longer news to us, so it becomes possible to disassemble the screwdriver and try to fix it with your own hands. But only without fanaticism, be careful when disassembling, especially such models as: interskol yes 12er 01, interskol yes 18er.

How the cartridge is disassembled

If the fixation of the cartridge is conical, then it can be removed simply. by gentle blows with a hammer on the block body. If the fastener is threaded, the following steps are required:

  • In the clockwise direction, unscrew the screw with a left-hand thread.
  • We squeeze the hexagon in a vice, put the key on it and hit it with a hammer. Likewise, the chuck should move from its original position. You can choose another option:
  • Place the screwdriver on a flat surface such as a table.
  • Turn it on.
  • Observe if the cartridge has moved off the table. When hitting a hexagon.

It also happens that all of the above methods do not work, and then one thing remains. to disassemble the screwdriver, after which:

  • Remove the gearbox and spindle;
  • Place the assembly in the vise clamps;
  • Take the pipe wrench and then detach the chuck.

And if debris is found in the gearbox, then you need to do so.

How to disassemble a screwdriver in general

Let’s analyze the disassembly, an example is a Makita screwdriver:

  • We remove the block housing where the battery is located.
  • We remove the screws that combine the two halves of the case with a Phillips screwdriver.
  • We take out everything that is contained inside the tool body.
  • Disconnect the reverse button.
  • Dismantle the speed switch.
  • Disconnect the engine and gearbox.

How to disassemble the battery

  • Detach the screws at the bottom of the box.
  • Open box.
  • Check and reject components.
  • Replace and reassemble.

The mounting screws on the underside can vary from four to six. Often unscrewed with a Phillips screwdriver. The screws come in various lengths. This must be taken into account in order not to confuse them during assembly. On some modifications, you can find a non-separable case. Then examine the entire surface and find a special strip along which the factory gluing passes. Next, you need to take a strong knife and insert it into the groove, slightly swaying to the sides. If the case broke into the upper and lower parts, the autopsy was successful. Not a problem if it happens past the groove. All discrepancies can be glued with good superglue. The upper part of the case contains several parts for the battery. The voltage is measured at each of these components, which must certainly be in the range of the optimal level. If the difference is more than 10%, such a battery needs to be replaced.

Each manufacturer strives to create a tool that will be as convenient as possible in the workflow, creating an extensive range of models. from basic screwdrivers to professional samples.

Hitachi screwdrivers prioritize excellent build quality as well as the practicality of their tools. The Bosch range of cordless screwdrivers is virtually indistinguishable from its brethren, which have a cord for connecting to 220 V. Equipped with mode switches, as well as an off button and an accelerator option, Bosch screwdrivers are an excellent solution for home and professional use. In addition, such brands as Interskol, Makita, Cmi, Zubr have proven themselves well.

Makita screwdriver device

The Makita screwdriver is a fairly simple design, which consists of several main parts:

  • Battery;
  • Engine;
  • Reducer;
  • Mode switch.

Additional devices can be added in some models, but the main components remain unchanged.

The inside of the Makita screwdriver is pretty simple. From the place where the battery is connected, the wires go to the speed switch, as well as the start button itself, from which contacts go to the engine. The engine is frontally inserted into a gearbox consisting of a whole set of gears of different configurations. The composition of the set depends on the number of speeds or operating modes of the screwdriver. Modes are switched using a special controller, which is brought out.

In a gearbox, gears with external teeth work in close connection with the housing itself, in which the teeth are located from the inside. And if in some parts the teeth are made of metal, then the plastic body itself includes plastic teeth. It is not surprising that such a structure wears out and fails over time.

Using a drill

The bolts are processed with a drill from the sides and, if necessary, shortened in length. It is necessary to give the bolts the shape of a real tooth and provide for the installation of the crown without interference.

Important! It is not recommended to overheat the bolt while working with the drill. Otherwise, it can become very hot and melt the surrounding plastic. The gear housing will deform, leading to more serious problems. So you need to take breaks while working. To let the bolt cool down.

Once the teeth are ready, the gear ring can be reinserted. If done correctly, it will insert without any interference. Two teeth are usually enough to restore the gearbox to work, so screwing in more bolts is not logical.

How to repair a Makita screwdriver

One of the most common problems with a Makita screwdriver is first speed problems. At the same time, everything functions perfectly at second speed. This problem is associated with a malfunction of the tool reducer, which does not allow effective use of the first speed. Consider how to get rid of this problem and repair the screwdriver.

Soldering new cans

Immediately after freeing the frame and the board from the old batteries, new ones can be connected to them. Before soldering, it is recommended to properly clean the surfaces on the cans and on the board itself from the remnants of past soldering. This will allow you to achieve better contact for a long time.

Now all new cans from other devices are placed in the appropriate places on the frame and are soldered to the power controller one by one. It is recommended to do this with a thick nozzle on a soldering iron, since a lot of solder will be needed. The contact must be very reliable and have a large contact area.

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After sequential assembly, it is recommended to wrap the entire structure in special paper and place it back into the case. Then the battery is reassembled and closed with a cover that is fastened with screws.

Before use, the battery must be recharged at a special station to full capacity, and only then only connect it to a screwdriver for testing. If done correctly, the battery will become functional again.

Replacement banks can be removed from other batteries or purchased separately. The cost for them is quite decent, but still manual replacement will cost much less than buying a new battery.

Disconnecting cans from the board

Using a drill with a disk nozzle, the cans are sawn off from the board. The connections of each contact with the controller are sequentially removed, and the elements are disconnected from the common frame.

It is necessary to do this quite carefully so as not to damage the board itself, but hard enough to completely disconnect.

How to repair a screwdriver battery

Battery powered screwdrivers are also very susceptible to battery wear. This happens over time even with proper use. If you do not follow the rules of operation, the battery will no longer hold a charge very quickly. And in this situation, there are two ways out: buy a new battery or try to repair the battery of a Makita screwdriver with your own hands.

The second option will require spending a certain amount of time and effort, and you also need special elements.

The battery of the screwdriver is a set of a number of special nutritional cans, which are soldered to the charging controller and make up an integral structure.

These nutrients can be found in power banks or laptops. There are also some such banks there. In laptops, 6 cans are usually used, and in power banks. 4. But the number may be different and depends on the battery capacity.

Screwdriver button repair. instructions and diagram

The screwdriver is a mobile tool that makes it easier to work with fasteners and screw connections.

Until recently, cordless screwdrivers could only be found in the arsenal of professionals, but with the advent of inexpensive household models on the wide sale, their popularity has increased dramatically.

Unlike an expensive professional tool, budget counterparts have a smaller resource, which is why they often fail.

One of the weakest points of a household screwdriver is the start button and the reverse switch. As practice shows, it is they who break most often.

Over time, the tool stops responding to any manipulation at all. Often there is a problem of the opposite nature, when the motor starts to work spontaneously.

In some cases, to eliminate the defect, it is enough to disassemble the tool and clean it, although more often a complete replacement of the screwdriver button is required. In both the first and second cases, you can fix the problem yourself. Everything in order.

Device and diagram of the screwdriver button

The screwdriver button is the main control element that performs several functions at once:

  • Turn on / turn on the instrument;
  • Switching the direction of rotation;
  • Smooth engine start;
  • Speed ​​control.

In this case, each of the controls built into the button block cannot work correctly by itself. Except for the direction of rotation switch, which is more often a separate function block.

In most cases, the body consists of three conventional compartments, in which working units and mechanisms are located.

  • In the lower part of the body there is an on / off control unit and an electric motor speed adjustment.
  • In the middle part is the "trigger" of the smooth start (the deeper you press it, the higher the rotation speed of the cartridge). When pressed, the button slides in a special block along the guides, a variable resistor is responsible for adjusting the speed.
  • In the upper part there is a reverse button. a switch for the direction of rotation of the cartridge. The direction is reversed by changing the polarity of the voltage applied to the switch.

This is approximately how all control units of screwdrivers of different brands are arranged. To familiarize yourself with the device of the button of a specific tool model in more detail, we recommend that you study the diagram of the screwdriver button (it is in the instructions).

How to repair a screwdriver button if it does not work. detailed instructions

To diagnose and repair a screwdriver, you will need the following tools:

  • Crosshead screwdriver;
  • Narrow flat-blade screwdriver.

As a result of active use of any power tool, dirt will inevitably accumulate inside its body.

Diagnostic steps:

  • We disassemble the tool body. To do this, disconnect the battery, unscrew all the screws (they can be hidden behind decorative overlays that will have to be removed).
  • We check the health of the electric motor. To do this, disconnect two power wires from the control unit and connect them to the battery contacts (the engine should start working).
  • We disassemble the screwdriver button. To do this, squeeze the plastic latches and separate the two parts of the button body.
  • We make a visual inspection of the state of the button for dirt and damage.
  • Next, you need to carefully assemble the screwdriver button, install it in place and test.


If cleaning the control unit did not work, it is necessary to replace the entire button unit.

For this you need:

  • Disassemble the screwdriver (the process is described above);
  • Install the new button in place of the old one;
  • Connect the motor to the button terminals (polarity is not necessary in this case);
  • Assemble the screwdriver by carefully placing the wires in the case.

It is very important to choose a button for a specific model of a screwdriver, since with all the external similarity and visual correspondence, the part may not fit into the grooves. Typically, new buttons are sold complete with battery terminals and transistor.