How to charge a screwdriver battery without a charger


To restore the charge, towing is used if the vehicle is equipped with a manual transmission. The battery should be slightly charged, since the method is to revive the generator.

Towing requires a strong cable that can withstand heavy loads.

The method is implemented with vehicles or with the help of assistants. To restore the battery, 1-2 races are performed.

How to charge a car battery without a charger

The question of how to charge a car battery at home without a “charger” may arise unexpectedly. Any driver will not hurt to know how to get out of a difficult situation with a dead battery and options for using available tools to restore it.

charge, screwdriver, battery, charger

Lighting up

A different power source is used to restore a dead car battery. This method differs in that with its help the battery is restored quickly enough.

For execution, wires are required, which are equipped with clamps that have the required cross section. The use of thin and damaged wires is not allowed. After all, their integrity is easy to violate.

For lighting, wires are used, which are equipped with a rubber sheath. After all, plastic collapses at negative temperatures.

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For lighting, wires are suitable, the permissible current of which is 200-300 amperes. They are the focus of wide clamps that provide adequate contact.

When connecting, focus on the shade of the wires. Red cables are connected to the positive terminal, only black wires are connected to the negative terminal. All connections are made before the motor is started. Only after that the engine of the donor machine is started for 5-7 minutes.

This method allows you to reanimate the battery for a while. The car battery is fully charged from the mains.

How to charge a power supply without additional devices?

How to charge a car battery without a charger? Is it possible? This option can be implemented, although it will require some preparation.

In order to charge the battery without a charging unit, certain knowledge in electronics is required. To do this, adjustments are made to the functioning of the relay-regulator, the voltage indicator increases. But such actions are performed only by masters who are able to do everything competently and accurately.

At home, the battery is reanimated by performing the following actions:

  • Sources that consume electrical energy are turned off. Such devices include an acoustic system, recorders and headlights, etc.
  • At standard vehicle speed, the gear is downshifted. As a result, the efficiency of the generator increases.

In the event that the electrical system is working normally, then the actions performed will allow the charge to be restored without charging. After carrying out these measures, fuel costs increase.

Before implementing the above recommendations, we test the main components and the electrical system. Particular attention is paid to the performance of the generator.

If the battery cannot be recharged, then it is worthwhile to establish the cause. Typically, this is due to:

  • Damage to the belt, which is focused on the generator.
  • Violations of the voltage stabilizer.
  • Violation of the integrity of the brushes, their wear.
  • Poor tension on the alternator belt.

DIY crafts for car enthusiasts

Recovery via laptop charger

It is not always possible to use the options listed above. Therefore, drivers are wondering how to charge a car battery by charging from a laptop.?

This will require certain items:

  • Wires equipped with copper conductors.
  • Charging.
  • Resistor (use of a light bulb is also allowed).

To prepare the power supply circuit, wires for the minus and also the plus are taken out from the charger. The negative wire is focused on the outside, and the positive wire is focused on the inside.

Connection is carried out as follows:

  • The first lead to the negative terminal of the battery is the negative wire.
  • A resistor or a productive light bulb with established characteristics, indicators is introduced into the prepared gap. Actions are performed taking into account the rules.
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Experts recommend introducing a resistor with the required characteristics into the circuit, since there will be no problems with changing the resistance.

Using this method, you can fully charge the battery. But the process is closely monitored. The voltage at the terminals is constantly checked. As soon as the voltmeter shows 14 Volts, the procedure stops. You can establish the end of the process by paying attention to the state of the electrolytic composition.


A battery for a modern car is a complex technical device. In its manufacture, harmful chemicals are used. lead, arsenic, sulfuric acid. Careless operation can lead to poisoning by vapors and metals, burns, fire and explosion of the battery.

The following rules should be followed:

  • The room must be well ventilated.
  • The surface of the skin must be covered with clothes, the eyes must be protected with glasses.
  • It is necessary to refrain from smoking, using open flames, sparking devices.
  • Avoid the accumulation of gases that are released during the process.

It must be remembered that the more powerful the incandescent lamp used in the circuit, the greater the charging current. In order to prevent overloading the battery, it is better to keep it below 3-4 A when charging.

When self-assembling circuits, you need to select all the elements in accordance with the requirements, to prevent overheating. It is not only the battery itself that can explode or catch fire, but also any of the electronic components in the homemade charging circuit.

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Power source charging methods

If the question arises, how to charge the battery without a charger, then this can be done in several ways.

Do I need to charge the batteries before storing?

If the cordless tool is not used for a long time, experts advise you to carefully consider the battery cells.

It is recommended to discharge nickel-cadmium batteries before storage, but not to zero, but to the point where the tool stops working at full capacity. In case of long-term storage, to restore the battery capacity, it is necessary to carry out 3-5 complete cycles of its discharge and charge. During the operation of the tool, it is also advisable to ensure that the battery is not partially discharged before charging, but completely.

Nickel-metal hydride batteries have a higher self-discharge rate than previous cells. They are recommended to be kept charged, and after a long “rest” to charge for about a day. Partial discharge is preferable for this type of battery. Their capacity decreases after 2-3 hundred charge-discharge cycles.

Lithium-ion batteries, which have no memory effect, can be charged at any time, whatever the degree of discharge. These batteries have the lowest self-discharge rate at the highest capacity. It is not recommended to fully discharge them, as this may disable the protective circuit. Power tools with such batteries are equipped with control electronics that disconnect the cell from the load when the temperature or voltage rises. It is recommended that these batteries be kept 50 percent charged. The number of charge-discharge cycles does not affect the capacitive characteristics of the cells, however, their life is limited by time and is about two years.


Among power tools, both household and professional, the screwdriver is one of the most demanded. With its help, you can not only twist and screw in self-tapping screws, but also drill holes. Mains-powered tools cannot be used always and everywhere, and the cord interferes with work all the time. Cordless screwdrivers are relieved of these disadvantages. With them, you can move freely and not depend on the presence of an outlet in the room.

An important element of every cordless tool is the battery, which allows you to work with it autonomously. This is very convenient, but sooner or later, each owner of such a power tool faces the question of how to charge the battery of a screwdriver.

Types of batteries used to operate the screwdriver

Before purchasing new batteries for the screwdriver, you must carefully study the instructions for the device. The tools required for work can be professional, household and semi-professional. Batteries for them differ from each other in capacity, quality and price.

For certain jobs, certain types of cordless tools are also intended, designed for different loads, therefore, different batteries are needed for them. The higher the power rating of the battery, the longer it can work. For convenience, it is better to have two batteries so that you can recharge the second when working with one. Often a second battery is already included when the instrument is sold.

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Various types of batteries can be used for screwdrivers. The most commonly used nickel-cadmium (Ni-Cd) and nickel-metal hydride (Ni-MH), and more recently also lithium-ion (Li-Ion).

The most common of these are nickel-cadmium batteries, which are compact in size, large in capacity and at an affordable price. These batteries can be effectively charged more than a thousand times, depending on their design, purity of materials, operating mode, including correct charging. However, these devices have a so-called memory effect, and if you charge them without waiting for a full discharge, the battery capacity will gradually decrease. In addition, the production of such elements is so toxic that the European Union abandoned it on its territory.

In second place in terms of frequency of use. nickel-metal hydride batteries, representing a new generation of similar devices. From an environmental point of view, both the production and disposal of these batteries are practically safe. The advantages of batteries of this type include the fact that they have less pronounced memory effect, and the disadvantages. high self-discharge current. These batteries must be kept charged and fully recharged when not in use for more than a month.

recently, more powerful lithium-ion batteries have been used for cordless tools. They also do not have such a disadvantage as the memory effect, which requires periodic discharge cycles to restore capacity. However, these batteries do not tolerate low temperatures well, and it is undesirable to work with them in cold weather. Despite their fast charge and high capacity, they are not very popular yet, as their price is quite high.

  • Types of batteries used to operate the screwdriver
  • Battery charging features
  • How long does it take to charge the batteries of the screwdriver?
  • Do I need to charge the batteries before storing?
  • What to do if the screwdriver battery does not charge?

How long does it take to charge the batteries of the screwdriver?

As a rule, the charging time of the screwdriver battery is indicated in the instructions for the tool. These recommendations should be carefully followed. Often the charger has a special display system to help you understand how the charging process is going. Thanks to this, you can easily determine with how much to charge the battery of the screwdriver. When charging is complete, you need to interrupt it in time so as not to damage the batteries. On average, the charger battery for a screwdriver can recharge from about half an hour to 7 hours. Practice shows that a Ni-Cd battery with a capacity of 1.2 Ah is charged with a current of 250 mA for about seven hours. Charging current is maintained using the mains adapter.

It should be borne in mind that there are two types of battery chargers. conventional and impulse. A standard conventional charger is more often used in a non-professional tool, it charges the battery in about 3-7 hours. Pulse. more suitable for professional mechanisms. Thanks to it, the battery performance can be restored in a maximum of an hour.

Battery charging features

How to properly charge a screwdriver battery so that it lasts as long as possible?

Batteries need to be charged before first use as they discharge during storage. In order for the battery capacity of the screwdriver to become the maximum possible for the nickel-cadmium cell, it is recommended to charge it three times and then discharge it. Thus, since the new battery has incomplete capacity, it must be brought up to full working capacity. After that, the batteries will need to be charged as soon as their capacity becomes minimum. Lithium-ion batteries are easier to use. They do not have a memory effect, so you can not bring them to full discharge and charge when it is convenient.

When charging, you need to take into account the optimal temperature regime of the process. It is better that the ambient temperature is above ten degrees and does not exceed forty. Batteries sometimes get warm during charging, but this should not be the case, as overheating adversely affects their performance, and they need to be cooled. It is undesirable to leave batteries in the charger. Yes, and it is better to store them by disconnecting them from the screwdriver, separately from the tool itself. If the batteries are not used for a long time, they should be recharged once a month.

It is better to buy rechargeable batteries at specialized points of sale. Correct use will help increase their service life. During operation, it is undesirable to discharge the elements completely until the engine stops. They will need to be charged as indicated by their markedly reduced performance.

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What to do if the screwdriver battery does not charge?

If the battery of the screwdriver does not charge, perhaps the reason is to look for its deterioration or in the malfunctioning of the charger. However, often the problem lies in the disruption of contact between the battery terminals of the screwdriver and the charger, as they unbend over time. In this case, you can disassemble the charger and bend its terminals.

In addition, after some time of use, both the battery contacts and the charger contacts may oxidize and become dirty. Even minor changes of this kind can prevent the batteries from charging properly. This usually translates into a significant reduction in both the charging time and the operating time of the cordless power tool itself. To prevent this from happening, you need to periodically wipe the contacts of the battery, the charger for the battery of the screwdriver and the tool.

Unfortunately, battery cell performance degrades over time. So, with improper use of nickel-cadmium batteries, most often used in household screwdriver models, they quickly lose capacity. Experts sometimes advise to “overclock” such batteries. The battery pack is disassembled and problematic items are identified. After that, they need to be charged. What current to charge the screwdriver battery in this case? Experts recommend that you first charge such elements with a higher current than it should be, then discharge them and charge them again, but with a small current. If the electrolyte has not yet evaporated in Ni-Cd batteries, this “therapy” may help bring them back to life.

In addition, you can restore one battery pack from two that have partially lost their capacity by selecting from them and soldering together whole “banks”. After that, to equalize the charge, it is required to fully charge and discharge the recovered unit several times.

Also, the reason is that the battery does not charge, it may be in the temperature sensor.

How to charge a screwdriver battery without a charger?

The situation when the charger of the screwdriver is not available, or has failed, cannot be called standard, so there is no easy solution to this problem. The best way out of this situation is to find and purchase a charger suitable for your model, since only it can safely and efficiently charge the batteries of your instrument. If this is not possible, there are fallbacks:

  • charge the battery with a car charger;
  • purchase a universal charger;
  • convert a power tool to be powered by an external battery.

Universal chargers

The purchase of such a device is justified if, in addition to the screwdriver at home, there are other battery-powered equipment. This capacity can be laboratory power supplies or model chargers. The advantage of this type of devices is their versatility and many adjustments, with which you can set the required charging mode.

Using a car charger

The main danger when using this method is overcharging the battery. The batteries used in power tools differ in their characteristics from automotive lead-acid batteries. A charger equipped with electronic current and voltage control is suitable.

The charging current is selected at the rate of 0.5 to 0.1 of the battery capacity in Ah. So, with a capacity of 1.3 Ah, the charging current is set from 650 to 130 mA. Lead acid chargers are designed to handle high currents and the required value may be out of range. In this case, a ballast resistor connected in series with the battery is used to limit the current. A car lamp can be used as a resistance.

Using an external power source

This is not the most convenient option in terms of operation. In the case when the tool is already old, and purchasing additional equipment for it is too large an expense, it can be used. A battery with the correct voltage is suitable for this upgrade. When using a powerful battery, motor protection should be provided. The easiest option is a 10 A fuse in the power circuit. Do not forget that the wires, when using low voltage, must have a larger cross section than when powered from a 220 V network.

When using non-standard equipment for charging the screwdriver, make sure that the devices are connected correctly, that the charging mode corresponds to the technical characteristics of the battery, ensure the safety of the process.