How to weave batteries in an electric screwdriver
Having opened the case, you can see the cassette of elements that provides the necessary voltage. Batteries are called “banks”, they are usually standard and voltage. Their difference is only in the container, which is indicated on the battery cylinder. The higher the power of the battery, the longer it will work.
It is better to have two batteries so that when working with one, you can charge the second.
Lithium-ion batteries contain a controlling fee, and elements are protected by a body or film. If lithium decomposition, then such batteries are not subject to restoration.
Some nickel batteries have a thermal attemptier. Nickel-cadmium batteries can be restored.
The battery of an electric screwdriver is disconnected and the fault is determined. Effective method for repairing batteries. Replacing faulty elements or “cans”.
The operating instructions are not recommended to disassemble and change the battery of an electric screwdriver. But the price of the battery is more than half the cost of the tool. Not everyone’s to buy a new tool, so some masters disassemble, repair, restore and change the main elements of the battery.
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Elimination of memory effect
Not always restoration of the battery of a screwdriver requires any radical actions. Often to restore the battery capacity, alternating complete charging (to the extinguished charging light) and the full discharge of the battery helps. This method is also called “swing the battery”.
How to erase the battery memory effect
It is associated with the so.Called “memory effect” and is characteristic of the batteries of the screwdriver based on nickel. And it is especially strongly manifested in nickel-cadmium. It occurs when the battery discharged to zero does not fully charge and begins to operate or vice versa. This leads to enlargement of the crystals of the active substance, which reduces the area of its active surface.
Follow the recommendations of the manufacturer for the charge and discharge modes.
The so.Called “training” of the battery helps to remove this effect or significantly reduce it. It consists in repeating the cycles of full charge and discharge.
For this, the restored battery is completely discharged, using, for example, a light bulb. Then they are completely charged and discharged again. Repeat the process of 5 times and if the individual elements of the battery are working, the characteristics will return to the norm or close to it.
Installation of accumulators of a different type
Nickel-cadmium batteries differ significantly from lithium-ion. So what batteries 18650 are better for an electric screwdriver? It is important to take into account the possibility of NI-CD elements both to charge and discharge with high currents. For such batteries, currents are quite normal, at which the category occurs in 5 minutes, which cannot be said about ordinary lithium-ion analogues. Thus, the choice should be approached responsibly and the high-precisely Li-Ion batteries should be selected.
Difficulties do not end there. Since the main characteristics (for example, working voltage) of the Li-and-CD cells are significantly different, it is impossible to charge the factory item to charge the lithium-ion battery block. You will need to purchase a BMS controller, which will control the charge and the category of a new block, as well as to balance the charge between the cells. In the absence of appropriate knowledge of video instructions from the Internet, they again come to the rescue. On the network you can find step-by-step instructions for replacing Ni-CD cells with LI-Ion with connecting the BMS controller.
Thus, even the lack of special knowledge does not make such, it would seem, complex operations impossible for a simple person who is weakly familiar with radio electronics.
Summarize. In what cases is it profitable to replace the cells instead of buying a new battery for an electric screwdriver? In the case of the replacement of some lithium-ion elements with other savings in relation to the purchase of one new battery, it can be 40-50%. It is clear that if you have never done this before, you will have to get tools for soldering, which for the first time slightly reduces the economic effect. As for the replacement of Ni-CD cells with Li-Ion, there is no need to talk about serious savings in connection with the need to purchase BMS controller, but it should be borne in mind that due to its energy intensity, the assembly on lithium-ion elements will be more effective and will allow you to work longer from one charge.
Whatever the savings when replacing the batteries, the main resource. This time. If you have a free evening and interest in the creation process, then the assembly of the battery block with your own hands can deliver a lot of pleasure and bring a useful experience that can be used in other areas. For example, various types of electric vehicles, whether it is an electric bike or an electric carpet, most often use assemblies based on lithium-ion batteries of the size of 18650. Having gained a certain experience of assembling batteries based on elements of 18650, you can save a lot where you can save by repair/replacement of the battery with your own hands.
The battery is assembled in the reverse order. Elements are installed in place, if necessary, electrical connections with external contacts are restored. Then the case is assembled.
The collected battery must be charged with a small current (0.1.0.2 from the container), then let several hours to stabilize self.Discharge. Next, the battery must be discharged on a working electric screwdriver. The process should be repeated 2-3 times to level the charge of all cells. After that, you can use the power tool in the usual order.
In conclusion, the replacement of old Ni-CD batteries in the Interskol screwdriver.
Do not perceive the review as a literal guide to action. Situations in each case are individual. According to the design of the battery and the degree of failure of its components. Using the general principles described above, you can independently replace the nutrition elements in any electric screwdriver, and the tool will last a long time.
How is the battery for an electric screwdriver?
And everything turned out to be just to banality. The case neatly lay 15 batteries wrapped in paper isolation, soldered with each other with point welding. The number of batteries pleased me, because I know for sure that if in the finger battery 1.5 volts, then in the same accurate battery only 1.2 volts, which means the batteries are quite standard. In addition to barrels, I discovered a part of a strange look and incomprehensible purpose. On the details there is a marking: D7ab 17 AM026A5-540. You can find this marking on the Internet, but what is it. I did not find. And another detail was. She looked likely so. Just like a piece of wire, but the fact that it was glued to one of the barrels of white paste made me suspect that this detail was the termistor. I took the multimeter, put it to measure the resistance and connected the device. Then he began to heat. The resistance began to quickly decrease. Thus, it really turned out to be thermistor.
Why the battery for an electric screwdriver needed a termistor? And very simple. It seems that a professional and very high.Quality device is sharpened on a super fast charge. With such a quick charge, batteries can overheat, and a smart charger does not allow this, either limiting the charging current, or turning it off at all.
The difference from nickel-cadmium batteries
Historically, the first truly mass batteries for manual power tools were nickel-cadmium batteries. At a low price, they fully allow relatively large loads and have a satisfactory electric capacity with reasonable dimensions and mass. Accumulators of this type are still widespread, especially in the inexpensive sector of manual electrical appliances.
The main difference between lithium batteries and nickel-cadmium batteries is a small mass with a high electrical capacity and very good load capacity.
In addition, a very important difference between lithium nutrition elements is a significantly less charging time. Such a battery can be charged in a couple of hours. But the full cycle of the charge of nickel-cadmium batteries takes at least twelve hours.
Alteration of an electric screwdriver 18V for lithium (Li-Ion)
Another feature is connected with this: while lithium batteries are quite calmly tolerate both storage and operation in a completely charged state, nickel-cadmiums have an extremely unpleasant “memory effect”. In practice, this means that to extend the service life, as well as in order to prevent the rapid loss of capacity, nickel-cadmium batteries, it is advisable to use until a complete category. Then it is imperative to charge to a full capacity, which takes a considerable time.
Lithium batteries are deprived of this drawback.
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The arguments “against”
- Lithium battery elements cannot be charged above 4.2 volts and discharge below 2.7 volts. In real conditions, this interval is even narrower. If you go beyond these borders, the battery can be disabled. Therefore, in addition to the lithium cans themselves, you will need to connect and install a charge controller in a screwdriver;
- The voltage of one element Li─ion 3.6─3.7 volts, and for Ni─CD and Ni─MH this value of 1.2 volts. That is, there are problems with the assembly of a battery for screwdrivers with a face value of 12 volts. Of the three lithium cans connected in series, you can collect the battery with a face value of 11.1 volts. Out of four ─ 14.8, out of five ─ 18.5 volts and so on. Naturally, the limits of the voltage during charge-discharge will also be others. That is, there may be problems of compatibility of the converted battery with a screwdriver;
- In most cases, Banks of Standard 18650 are used as lithium elements for alterations for remodeling. In size, they differ from Ni─CD and NI─MH banks. In addition, you will need a place for the charge controller and wires. All this will need to be fitted in the standard housing body of the screwdriver. Otherwise, it will be extremely inconvenient for them to work;
- The charger for cadmium batteries may not be suitable for charging the battery after its alteration. Perhaps it will require a finalization of the BOD or the use of universal charges;
- Lithium batteries lose their performance at negative temperatures. This is critical for those who use screwdriver on the street;
- The price of lithium batteries is above cadmium.
An example of a replacement of the Ni-CD battery with Li-Ion in an electric screwdriver
Examples of replacing a nickel battery with lithium-ion can be found on the Internet. For work, use a soldering iron, thermocles and other tools.
It is important to observe all the necessary sequences so as not to break the work of the product. With a neat and careful approach, even at home, you can replace one elements with others.
It is not difficult to replace the batteries on an electric screwdriver, any man at least slightly disassembled in electricity will cope with work.
Determination of a malfunction
Before eliminating the malfunction, it is necessary to find out if it is really present. For this purpose, the following actions are performed:
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- Turn off the battery from the product, while it should be completely charged.
- Disassemble the battery body using a screwdriver.
- Extract all banks from the product.
- Using a voltmeter on each bank, a voltage is measured. For nickel-cadmium products, an indicator of 1.2 volts is considered normal, for lithium-from 3.6 to 3.8 volts.
- After the measurements, the voltage is the least for what details, it will be of poor quality.
- The battery must be assembled and installed in the tool, after which it is completely discharge.
- After that, it is required to disassemble the part again, and then repetitions. The element with the lowest indicators must be changed.
Important! Replacing low.Quality elements is quite simple, they are connected in a regular sequence, taking into account the pluses and minuses. This applies to all models Makita, Bosch, Bison, Metabo, Dewalt, Interskol, Diold, AEG.
What is a screwdriver? (with illustrations)
A power screwdriver is a screwdriver that uses any source of energy to work to screw the screws, and not relies on human muscles.Screwdrivers usually work from electricity, and although they can use a standard outlet, battery tools are much more common. In screwdrivers with batteries, you can use standard batteries, but often they are equipped with a special rechargeable battery. These tools have become very common and favorite contractors, carpenters and home.Made lovers around the world.
Standard battery is a standard for all screwdrivers.These tools often resemble a standard battery drill with the configuration of the pistol handle and the battery located in the lower part of the handle. Most tools of this type are equipped with a clamping system, like a standard drill, usually manually controlled, which allows you to quickly change the bats. The screwdrivers are available in many sizes and shapes. Standard slotted screwdrivers and Phillips screwdrivers are widely used all over the world, but dozens of other forms are possible, for example, hexagonal, star, square and even triangular.
Another type of electric screwdriver is a battery electric screwdriver.The battery screwdriver is configured in the same way as a standard screwdriver, but with an enlarged handle in which batteries are placed, which can be standard disposable or rechargeable elements or a special battery. These types of screwdrivers usually do not have a cartridge to hold the bit, but still allow you to replace the bats using a simple snap function.
Many modern versions of these tools also include other functions.The simplest of them is the ability to change the direction using a simple button or switch. Most built.In batteries can be blocked so that they can work as a standard tool driven by a person in case of failure of batteries. Professional and other high.Quality tools can have other functions, such as the ability to store bats in the tool, additional batteries, long.Term battery life, adjustable speeds and rotary units for hard.To.Reach places and working lights.
Any standard drill with an adjustable number of revolutions can be used as a screwdriver.Just reducing the speed of the drill, which usually works at much higher speeds than a conventional screwdriver, and using a changing nozzle for a screwdriver, an electric drill can be quickly converted for use in screws of screws. These tools often require a cartridge key to change bit and lose part of the possibility of quick replacement of special battery screwdrivers, but still work much better than outdated models with food from a person.