Makita battery charger doesn’t charge. Top up with distilled water

Why the battery of an electric screwdriver does not hold a charge or does not charge at all?

A cordless electric screwdriver, can always be useful in the household, but over time, its power source suddenly fails to work. It is expensive to buy a new electric screwdriver. Its price is about 70% of the cost of the battery. And because models change frequently, it is quite difficult to find a new battery for a particular tool. So the question arises. what to do next. Buy an electric screwdriver or look for a similar battery? But this problem can be solved by repairing the battery itself, prolonging its life for a few more years.

Three main types of batteries are usually used to provide autonomous operation of power tools, about which it is necessary to tell in more detail.

Ni-Cd or nickel cadmium power sources

Used for a very long time and completely deservedly considered the oldest batteries installed on a variety of modern equipment. Their main advantages are:

  • The lowest self-discharge, so that the battery can dust for a long time somewhere in a closet, and then work quietly without recharging;
  • Not a bad capacity with a very compact size, which ensures a long autonomous operation of the screwdrivers;
  • resistance to low temperatures, because of which Ni-Cd cells are often used in all-weather machinery;
  • low price.

The disadvantages include the need to constantly go through a complete charge-discharge cycle of batteries. If they are not recharged fully, they suffer from the so-called memory effect. The battery works worse and worse, and then shuts down completely.

Ni-Mh or nickel-metal hydride power sources

Considered to be the improved analogue of Ni-Cd batteries, but the only advantages are their cleaner production and somewhat reduced memory effect. In general, however, this battery variety is inferior to the nickel cadmium batteries in terms of. The thing is that they have a very high percentage of self-discharge. In order to use the battery effectively, you need to constantly recharge it, which completely loses autonomy.

makita, battery, charger, charge

Li-ion, or lithium-ion power supplies

These batteries are installed on almost any equipment, including power tools Makita, Interskol, Bosch, as well as numerous gadgets. The list of advantages is as follows:

makita, battery, charger, charge
  • extremely high capacity;
  • almost no memory effect;
  • the ability to be equipped with special controllers that monitor the level of charge and count charge-discharge cycles;
  • low percentage of self-discharge;
  • resistant to high loads, possibility of use in high-power machinery.

Disadvantages of lithium-ion batteries. unstable operation in cold weather, as well as high cost in comparison with the above described counterparts.

You solder or repair flooded GTX 760

Hi all. From this post from time to time there will be repairs made by me at the service center where I work (if interested, all links will be in the telegram).Anyway, I received a Palit GTX 760 graphics card with 2 GB of video memory.

The defect according to the owner. poured, then ceased to be defined in the system. Inspecting the video card and yes, there are traces of flooding. There’s a lot of flooding.

Ok, I thought, I’ll have to struggle to find the right resistors and capacitors. But never mind. I disassemble the video card and.

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And then I was so friggin’ crazy. I’ve never seen anything like this in my practice before. Fluid even leaks from under the screw securing the cooling system. Sighing heavily gently disassemble the video card (in order not to get dirty with this substance) and just fell into shock. See for yourself:

Yeah, I certainly did not expect that. Okay, I put a price tag and send it to the customer for approval. After a while I get a reply from the client that it needs to be repaired. Eh, I did not want to do this, but apparently have to. I replace the rotten elements and run it in my test bench.

And yes, the card is detected and gave me a picture. Already can be happy, but the image seemed to me kind of strange. And yes, when I run any test I see a greenish tint which obviously should not be. I took a screenshot and it shows a normal picture.

This is the first time I encountered such a defect, so I decided to take some time to think. Well, while I think I start to wash the video card.

Under a stream of hot water wash off all the fluid on the casing of the cooling system (what is the fluid I did not understand, it is very thick, but under a stream of hot water is removed in no time).

And threw all the metal items in the alcohol for half an hour, stirring them occasionally.

While everything was drying I decided to look for a boardview. I couldn’t find it for this particular card but I found a boardview on 760 from Asus. The parts I needed were in a different place, but armed with a multimeter I found the right ones. As a result, I found the missing resistor, after soldering the last resistor the video card began to show a normal image.

Yay, I’m almost at the finish line. After half a day of testing fill all the problem areas varnish green, drying and reassembling the video card.

Putting the video card to the test for a few days:

Disassembling the case of the standalone power supply

Once you are convinced that several cycles of deep charging / discharging the battery have not yielded a positive result, and the battery is still discharging rapidly, follow the step-by-step scenario. Let’s take the screwdriver battery as an example. Makita.

  • Charge the device before starting the disassembly process.
  • To gain access to the capacitive elements of the battery, you need to unscrew a few fixing screws.
  • In some cases, you need to gently hack the case at the joints of the parts of the design.

Caution: do not use excessive physical force when performing the last option of disassembly, as you may deform the plastic of the battery case. Remember: after restoration, the container must stand securely in place.

Banks that don’t hold money

Speaking about electric screwdriver battery recovery, it is impossible not to mention that the batteries, which the contract construction tool is equipped with, can have different technical characteristics. Often such a vigorous personality the power source plays an important role during operation. For example, nickel should be preferred in low temperatures.Cadmium batteries. Whereas nickel-metal hydride type batteries are more durable in use and can have a relatively high capacity. Meanwhile, lithium-ion batteries are also widely used. This type of power pack requires no maintenance at all, it is devoid of memory effect, and most importantly at high power, the energy banks of the battery are more compact than competitors.

  • With a sharp knife (ideally a scalpel) cut the contact plates and. with a faulty tank.
  • Using a household soldering iron and fusible solder to add a new capacitive cell to the total. Energy Binding Battery.
  • Follow the polarity when installing a new tank.
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Important: Do not overheat the case when soldering. Use special acid and catalytic fluxes.

How to charge a screwdriver battery: rules, times, subtleties

If you are using the tool for the first time, it is recommended that you always charge the battery. When an electric screwdriver lies in storage or in a store without use, the batteries are always discharged, and this should always be kept in mind when buying.

If you own a nickel cadmium battery, be sure to charge and discharge it three times before working. It is necessary to optimize the battery’s capacity. After that, standard charging will be required. You can do the same thing with a nickel-metal hydride battery.

The most “problem-free” in this case are the lithium-ion batteries. They have no memory effect and may only be recharged when not fully discharged.

It is advisable to follow a few general rules for charging, which can be applied to all screwdriver batteries:

  • Charge the battery at temperatures not lower than 10°C and not higher than 40°C.
  • Ni-MH batteries tend to heat up quickly. Therefore, the charging process should always be monitored to avoid overheating.
  • Remember that other batteries also heat up. particularly if the temperature in the room is very high.
  • Take care of the cooling of the cells in order to prevent them from failing.
  • Do not leave batteries in the charger. if you do not charge them.
  • Store the battery better if it is removed from the electric screwdriver. that you do not plan to work with in the near future.
  • Remember to recharge them once a month if they are not used for a long time. It prevents deep discharging that can have a fatal effect on their capacity.
  • a small recharge of the battery can last 30 minutes;
  • the battery can be left charging for 7 hours at the most.

The amount of time you need to charge a particular tool is always included in its instruction manual. And it is always recommended to carefully observe.

It is important to remember that there are different chargers. There is a charger with a charge level indicator, which allows you to monitor the process and understand when it is finished. When charging is complete, stop it immediately to avoid damaging the battery.

There are different types of power tools for different types of screwdrivers:

  • standard, ordinary “charger”. suitable for amateur tools;
  • pulse. more powerful, included in the package of professional tools, can charge an electric screwdriver within an hour.

Possible causes of “death” of lithium-ion battery

During the course of their use lithium-ion batteries gradually lose their ability to hold a charge. A large number of charge-discharge cycles and prolonged exposure to elevated temperatures cause disturbances in the movement of lithium ions and further damage the battery. Also the reason why the Li-Ion battery does not charge can be a problem of corrosion of the current conductors. Metal damaged by corrosion is unable to adequately move electrons.

Corrosion in the battery is usually caused by the interaction of the electrodes with the electrolyte. Graphite interacts with the electrolyte from as early as the first charge. As a result of this interaction, a porous layer is formed which protects the anode from subsequent influences. It is effective in normal temperature conditions, but partially dissolves in the electrolyte at elevated temperatures and excessive storage discharge. When normal conditions resume, a new protective layer is created, but this process wastes lithium. In the end, you need to charge the battery more and more often.

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If the layer protecting the graphite anode is very thick, it will prevent the lithium ions from moving freely. As a result the capacity of the battery decreases. Therefore, it is very important to avoid critical discharge and extreme temperatures when using lithium-ion batteries. If to neglect these requirements, very soon you can ask a question. why the lithium-ion battery does not charge?

How to charge properly

After the purchase and before the first use, it is necessary to check the level of charge, then proceed according to type.

If this model has no “memory effect”, you can charge it immediately and start working, otherwise it will require preparation:

  • Ni-Cd: Discharge twice or three times and then fully charge to reach full capacity, then use the standard charging procedure;
  • Ni-Mh: it is also possible to “pump” like the previous version;
  • Li-Ion: does not require a full discharge at all (it is even harmful), so you can charge it immediately.
  • The recommended temperature is 10-40 Celsius (or according to the instructions);
  • Ni-Mh can overheat, for this reason it is necessary to control the charging (the others may also overheat, so in the heat or in a warm room it is necessary to arrange cooling for the battery, if necessary)
  • A charged battery should be disconnected from the charger.
  • if the tool is not used, it is best to disconnect the battery from the tool as well
  • If stored for an extended period of time, recharge periodically;
  • consider the characteristics of each type (Li-Ion and Ni-Mh batteries must not be discharged, whereas Ni-Cd batteries can be stored discharged).
  • first of all, according to the instructions of the device, additionally paying attention to the indication on the charger;
  • if recharged quickly, at least half an hour (again, if not contrary to the manual);
  • A full charge can take up to 7-8 hours; consult the documentation of the device for exact times.

Pay attention to the type of charger. In the amateur segment a simplified scheme is used, while professional models can be equipped with pulse variants. They are more “smart” and powerful, so the full charge time can be about an hour.

What to do if the battery does not hold a charge?

Russian battery for electric screwdriver “Interskol” on quality is not inferior to branded analogues. However, the cost of domestic batteries, without exaggeration, is sparing. For those who are not confident in their abilities, who “easier” to buy a new battery than to restore the old one. this is an option. Those two or more for which the design is intended, when the structural part of the energy container has the exclusive forms (grooves, locks not specific curves), despite this will have to devote a few minutes of their precious time to technical creativity. Because it will be necessary to repack the battery into its “native” case. And how to charge the battery of an electric screwdriver not what to do, when the battery is not charged on the basis of a long standstill in a discharged condition, you already know. Effective methods of restoration don’t forget about your safety. not the safety of those around you!

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