Batteries fully charged when loaded the electric electric screwdriver stops

How to properly charge a battery

For battery charging rules for each specific model of electric electric screwdriver, refer to the instruction manual. This should be done before you start using it. Let’s look at the advantages and disadvantages of different types of batteries. Each has its own characteristics of charging, discharging and storage for a long time.

In terms of composition, the most popular varieties are:

The most common and affordable battery is still nickel-cadmium (Ni-Cd). All manufacturers provide a wide range of models with these batteries. Let’s take them as an example and look at the basic rules for charging.

When charging a new battery or after a long period of inactivity, there may not be a full charge. This is a normal situation, although there may appear to be some defect. The battery will be fully charged after several complete discharges. Such a battery has what is called a memory effect. That is, the ability to acquire a capacity that will be equal to the capacity of the first charge and discharge cycles.

To get the most out of your battery, it is recommended that you charge and discharge fully the first five charge and discharge cycles. That is, fully charge after fully discharging the device. It is recommended to charge the battery before the first use, or when it does not deliver the necessary supply voltage.

The battery may become slightly warm while charging. This is normal and does not indicate a problem. Must be charged in a heated room. Temperature may vary from 4 to 35 degrees. Should be stored at least 5 degrees Celsius, in a room with normal humidity. Charge the battery at least every 3 months.

Lithium-ion models are rapidly gaining a niche in the market. This is because they have no memory effect and have a much higher charge rate than nickel cadmium batteries. Can be recharged at any time and do not fear for the capacity of the battery. The main disadvantage of lithium-ion is the price. But for a professional tool, price is a priority.

Nickel-metal hydrides are common, but very inferior in popularity. The advantage of these models is the absence of the “memory effect”. But there is a big disadvantage: high self-discharge. It is a phenomenon in which the battery itself discharges over time.

In terms of time, the charging rate of each individual device is individual for each model of electric electric screwdriver. This information can be seen in the manual. For example, if it’s an 18 V battery with a capacity of 1 V, the battery could be charged at least twice as fast.5 A/h, it will take one hour to charge. At 14.4 V 2Ah battery will take 3-5 hours to charge. But you should not keep the battery too long on charge. With a very long charge, the battery can get very hot and start to lose its properties.

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If you need to charge an electric electric screwdriver, but don’t have a charger (broken, lost, stolen. there may be different cases), then you can resort to using a universal charger. With this method of charging, you must follow the instructions carefully so as not to spoil anything.

It is important to understand that the current intensity (indicated on the charger) directly affects the charging time. So, at 400 mA, a 2 Ah battery will take 5 hours to charge. If the current is 2000 mA, the same battery will charge in 1 hour. A smaller and more gradual charge results in a longer battery life. A high charging current saves time, but it makes the battery warmer.

In some cases, you can charge the battery from an electric electric screwdriver with a car charger. Remember that the car charger gives a voltage of 12 volts. It can therefore only be used to charge 12 volt screwdrivers. In rare cases 14.4 volts, but no more. And be sure to remember that the current should not exceed 1-2 A.

Screwdriver battery design

The number of battery cells in the battery depends on the power of the tool and the type of battery itself. For household screwdrivers drills, grinders and other small equipment of the same class, usually connect 4 to 16 cans in series. Compact and powerful battery banks are more expensive (much more expensive), but take up less space and are lighter in weight. The lighter the battery, the easier and easier it is to work with hand-held power tools.

The banks are connected to each other by contact plates. The contacts from the first and last are led out to an external terminal block on the housing. These are the power terminals through which the charge/discharge is made. On the same pins you can measure the total charge of the battery.

batteries, fully, charged, electric, screwdriver

You don’t need a schematic diagram of an electric electric screwdriver battery. All batteries are connected one after the other

In general, the contacts on the connector can be four or five. Five pins are in the technique of more expensive, batteries which are assembled on lithium banks. They need to control the current charge of each of the banks, so you also need a control board and a temperature sensor. And they require a more sophisticated charging station that balances the charging currents.

How to check the batteries in the battery

After the battery is fully charged, take a multimeter and measure the charge of each battery. Full charge. until the light on the charger goes out. Set the voltage measurement mode on the multimeter, selecting the appropriate measurement limit. Applying the probes in turn to the contacts of each of the batteries, measure the voltage on them. If it is lower than it should be, we mark it somehow.

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The level of charge on each of the cans depends on the type. As already mentioned, it should be 1.2 V for nickel banks and 3.6 V for lithium banks. Allowable difference. 10-15%. If the reading is lower, it means that the bank “sagged” the total charge of the battery and it is worth replacing, so mark it.

To restore the screwdriver battery you need a multimeter

Insert the battery and work until the power of the screwdriver drops significantly. Disassemble the case again and re-measure the voltage. This time it’s residual. The damaged banks will have a higher drop than the normal ones. This way you can see definitively which ones you need to replace.

There is also a second way to check the batteries. You will need additionally a bulb of the corresponding voltage. For 12-volt battery, the bulb is the same. After the screwdriver battery is fully charged, connect the lamp to the battery terminals and wait until the battery is fully discharged. Disassemble the battery and measure the residual voltage of each bank. The ones with the smallest ones are the ones that drain the battery. They’re marked and replaced.

How to Choose a Battery to Replace

In general, it is better not to change the type of batteries. And if you change it, then together with the charger. nickel and lithium batteries have different charging currents, so the charging stations have different characteristics.

How to Repair Electric Screwdriver

The key parameters are marked on the body of the battery

Next, we look at the parameters of the battery banks, such as voltage and the number of ampere/hours that the battery is able to accumulate. If you choose to replace several batteries, then it makes sense to take similar characteristics. If you change all batteries, you can take a bigger capacity (number of ampere/hours), because the screwdriver will work longer on one battery charge.

Breakdowns in the electrical part

In the electric circuit of an electric electric screwdriver the batteries often fail, the second place is divided between the buttons and the motor, in which the brushes are most often damaged.

How to repair the battery with your own hands

To repair the battery, a preliminary check is necessary. To do this, the battery is charged and tested for its power output over a certain period of time. If the charge given is low, the nickel-cadmium batteries can be tried to restore.

If the voltage is low and the current is too low, the battery has to be repaired. The repair consists of finding the defective cells and replacing them. With lithium-ion battery packs, because of the series connection of the batteries, you have to use charge balancing controllers, which can make repairs much more difficult and require the help of a qualified electronics technician. This is especially important because lithium-ion batteries can be source of fire if not properly repaired.

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Brush replacement

Brush changes are done quite often, especially for screwdrivers used by builders and installers who work with stone or near source of stone dust. For example, it’s enough to assemble a wooden rack in a cement warehouse with an electric electric screwdriver that the brushes are nearly half worn out.

To replace the brushes, disassemble the electric electric screwdriver, remove the motor and then take out the brushes. How exactly this is done depends on the motor design. Sometimes the brushes are held in place by plugs (the easiest way to replace them), or sometimes the brushes are pushed out toward the axis of the manifold. In some cases, you may have to use a device to temporarily hold the brushes in place during assembly.

Problems with the button

Buttons can break from brute force. Often splinters, small pieces of metal from self-tapping screws or sheet metal get inside and stick to the hands of the person working. This garbage causes the button to jam, and if it is not removed in time, it easily borrows the plastic body in which the button and regulator are installed.

As a result, the regulator becomes unstable, the speed of an electric electric screwdriver jerks, and in the end it completely fails. The same applies to the reversing switch if its design is unsuccessful in protecting it from dust.

Repair of these parts is not always possible, it again depends on the specific design of the pushbutton assembly. often than not, it is necessary to replace the whole unit with a new one. Electrical faults can be corrected by replacing parts.

Measuring the Voltage of a Battery Battery

A battery consists of 10 or 12 cells, 1.2 volts each. First look at the quality of the connection. Sometimes some of them come off, causing problems with the tool.

Schematic diagram of an electric electric screwdriver battery

If there are no problems with the contacts, measure the voltage of each part of the drive, which should not be less than 1.2. The soldering iron is unsoldering the contacts. The power cells should not be connected to the sensors. Connect the probes to the poles. If the voltage is less than normal, replace them with new ones.

It may happen that the test finds no defective components. Then repeat the process under load. Connect a 12 volt bulb through a 10 ohm resistor of 25 watts. Calculate the internal resistance level by dividing the voltage by the amperage, subtracting the load resistance. Turn on the bulb for 2 minutes. The brightness should not change. If it goes out quickly, the storage capacity is insufficient.

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