What a charging current of the screwdriver battery. How to charge a battery for a screwdriver without a charger

How to charge and store a screwdriver battery

Scurget is one of the most popular in the home and professional activities of power tools. It allows not only to tighten and twist various types of fasteners, but also to drill holes. By the method of power supply, the devices are divided into network and battery. Models with batteries are practically not inferior to their performance tools operating from the 220 V network. In this case, with their help, you can perform working operations in autonomous mode. It is also convenient that the supply cord does not limit the movement. But you should correctly charge and store the battery of the screwdriver so that it serves for a long time. Many problems with the battery block can be eliminated independently by using the cause of the malfunction by a multimeter.

The battery is source of energy for wireless models of screwdrivers. Due to the leakage of physico-chemical processes (electrolysis), this element accumulates electricity, and then gives out a constant voltage of the desired value at its corresponding outputs. Stress and container are the main parameters of any drive. The first shows the potential difference between the cathode and the battery anode. The voltage is measured in volts. The capacity determines the amount of current issued in 1 hour of the battery, so this parameter is measured in ampere hours.

In different models, the battery block (battery) looks and is arranged in a similar way. It consists of the following structural elements:

• Hulls with contacts located on it;
• Feeding elements (batteries);
• Temperature sensor circuits (termistor), which performs the function of protecting the block from overheating (the range is from 50 to 600 degrees).

Not all models are equipped with thermistors. The case usually is a plastic box consisting of two parts. He contains mainly about 10 batteries, and sometimes their number more. In this case, the nutrition elements are connected to each other in the chain. Free terminals of extreme cans are connected to the contacts located on the case designed to power the tool electric motor and connection to the charging equipment. Output voltage of the battery It is determined by summing up this parameter of all batteries connected to a single circuit.

• 2 power (“”, “-“) designed for charging and discharge;
• One top controllers associated with thermistor;
• One contact used for charging from special stations that can align the value of the charge in all power elements available in the block.

By type of nutrition elements Battery drives are divided into such types:

• Nickel-metallological (indicated-nimh) with a voltage of 1.2 V;
• Nickel-cadmium (marked nicd) at the output also issue 1.2 V;
• Lithium-ion (designated by Li-Ion symbols), in which the voltage depends on the number of supply elements in the battery and can be in the range of 1.2-3.6 V.

A separate battery consists of the following structural elements:

• Positive and negative contacts;
• Electrode with a positive charge;
• External coating of the case;
• Electrolyte;
• Negative electrode.

The most widespread nickel-cadmium energy drives due to an affordable price, compact size and a large capacity. They can be reloaded more than 1 thousand times.

What can you assemble a power supply

The power supply unit for charging a screwdriver can be made according to various schemes. It all depends on the qualifications, the availability of devices and available materials.

From a computer BP

A good supply unit for a screwdriver with a voltage of 12 V can be obtained from a BP for a computer. First you need to check whether it is suitable for parameters.

Easy battery replacement for Li-Ion 18650, calculation of charge time / NEW battery for screwdriver

In the above example, the BP has two 12-volt channels-at 11 A and 13 A. Each channel is enough to power the selected power tool for 12 volts. On the Internet you can find tips on the parallel connection of the channels until the total current is obtained (in the given case. 24 A). It is not recommended to do this, because due to the difference in stresses, one channel can become a consumer for another. The whole risk of choosing the owner. A loop of wires comes out from the power supply. Everything must be cut off except:

Sometimes you need to leave a red wire. Some schemes require the basic load. To do this, between red and any black, you need to connect a 12.Volt light bulb. If in its absence the PSU does not turn off, then it can be removed. The green wire must be connected to any black. And 12 volts remove from yellow and black (any) conductors.

From the transformer

If there is a suitable transformer, you can build a power source on it. The general scheme of an unstabilized power source is shown in the figure. Such a device consists of:

If there is a ready.Made industrial transformer, you need to find his data according to the directory. If they arrange, BP can be assembled on it. If not, it can be redone by first checking its suitability for work in the required conditions. The suitability of the transformer is determined by its power. If you set the output current of 10 A, a voltage of 14 V and the efficiency of the system (from the transformer to the output shaft of the screwdriver) equal to 0.5, then a transformer with a power of P = 10 A14 V/0.5 = 280 W is required (you can round to 300 Tue).

To determine the power of the transformer by iron, you need to find the area of ​​the cross.Section of its core in centimeters (in most cases you can remove the dimensions without disassembly). The resulting area in square centimeters SC must be substituted in the formula:

If the result is exceeds 300 W, the transformer is suitable for the manufacture of a power supply. Next, you need to remove all secondary windings and wind up a new. The number of turns can be determined experimentally. To do this, you need to wind any known number of turns with any wire and measure the output voltage. Suppose, having wound 10 turns, the output is 5 volts. So, one volt has two turns, and to obtain 14 volts you need to wind 28 turns. For 10 ampers, the cross.Section of the wire must be at least 2.5 kV.Mm, this corresponds to a thickness of 1.8 mm.

After the manufacture of the transformer, you need to choose diodes capable of working at the selected current. They must be put on radiators. And the last is to install a smoothing capacitor. It should be designed for a voltage of at least 25 volts and have a capacity of 4000-10000 μF (more can increase, but the dimensions will increase). For such tasks, the transformer power supply is quite bulky and heavy.

It can be supplemented with a voltage stabilizer, then it will maintain torque at any load (but this is not necessary. After all, in the normal mode, the batteries also sit at a large current).

You can assemble a stabilizer on an integrated chip of the 78xx series (79xx for a negative shoulder), destroying it with an external transistor.

The finished source must be placed in the case. It can be done on your own or pick it up with ready.

From the laptop

A good result can be obtained by applying the side of the power from the laptop. Such devices are designed for the output voltage of 19 volts and for various load currents. You can choose source that issues a current up to 6 amperes, this is enough for most homework. You should not overload such source. The protection will work or the self.Healing fuse at the input will turn off (it is not always restored independently, and you have to replace it).

Universal PSU

To power a screwdriver, you can use adjustable and unregulated DC power sources used, for example, in laboratories. Their advantage is that the output voltage can be adjusted and installed, depending on the power tool model, both 12 V and 18 V. The problem is that it is difficult to find a laboratory voltage source designed for an output current 10 A. So, the block presented in the photo for each channel has a current limitation of a slightly more than 3 A. The voltage is about zero, so the screwdriver cannot work in this mode. At best, this power supply will provide an idle power tool.

Impulse source

The best option is the impulse power source. Light, compact, does not contain a powerful heavy transformer due to the fact that the transformation of the voltage level occurs at a higher frequency. The disadvantage of such a solution is a complex circuitry. To make a pulsor with your own hands, a certain qualification will be required.

How can you charge the battery from a screwdriver?

Lithium batteries represent a galvanic pair in which lithium salts serve as a cathode. Independently, lithium-ion, lithium-polymer dry or hybrid battery, charger is suitable for everyone.

Whether it is necessary to charge the battery before long.Term storage

Nickel-cadmium elements It is not recommended to be discharged for long.Term storage. In order for the battery capacity to recover faster, during storage you can charge 3-5 times and discharge the battery. During work, too, you need to watch that the element is discharged before charging.

The range of self.Discharge u Nickel-metallogidrides higher than other power sources. They are advised to leave for safety completely charged, and then charge for 24 hours.

The simplest Lithium-ion batteries deprived of the “memory effect” completely. Their self.Discharge is low, the capacity is large. But such a battery is better not to discharge completely, otherwise the protective function will be turned off. Screwdrivers equipped with lithium elements are equipped with electronics. In case of voltage difference, it turns off the battery. The charge-category does not affect the properties of a power source, but their service life is low- 2 years.

Often, a charger is already in the kit

We revive the nickel-cadmium battery

The screwdrivers equipped with nickel-cadmium batteries have practically the past. But they are still sold, found and even work, since the Ni-CD elements can “live” up to 20-25 years, although they withstand about 900 “charge/discharge” cycles. Another feature of nickel-cadmium batteries-they can be stored in a discharged state. So if you found a grandfather’s screwdriver with a Ni-CD battery in the attic, then it makes sense to try to revive it.

We will try to charge the battery. Any burden capable of providing the desired voltage and current equal to half the battery capacity is suitable.

We turn on, try to charge. If the battery takes charging, then we continue. If there is no half.Zero on it, we move on to the plan “g” and “p” (see. Below).

As soon as the voltage on the battery reaches the value of 1.37 V, multiplied by the number of batteries, we stop the process. But that’s not all. Not the fact that the battery is fully charged. Nickel-cadmium batteries suffer from the so-called memory effect. If they were constantly discharged, say, up to 60%, and then put them on charging, then they will get used to it and then they will refuse to work when discharge for all the same 60%. Therefore, we discharge our battery with approximately the same current as they charged. We discharge to a value of 1 V, multiplied by the number of batteries. As a load, you can use car lamps or a screwdriver itself.

After that, we are completely charged again. Repeat the operation “charge/discharge” 3-4 times. We fully charge and try to use a screwdriver. If even after all these manipulations, the battery capacity is significantly lower than the declared, then, unfortunately, in our hands a decrepit, outdoor old man. He cannot be resuscitation.

Plan “w”, pushing

Plan “g” consists in the “pushing” of the battery in short (0.2-0.3 sec) high current pulses. Over, the current should be much (ten times) more than the battery capacity. “Pushing” is better each battery separately. Therefore, we open the battery, find out where each battery has plus and minus. As a pusher, we will use a car battery, but any other powerful source with a voltage of 10-15 V is suitable.

We connect the minus of our element to the minus of the “pusher”, connect one end of the wire to the plus of the “pusher”, and the second end we briefly touch the plus output of the Ni-CD element. Frequency of touches-2-3 per second. As a result of such a burning, dendrites causing microsyps are eliminated, and the battery comes to life.

The operation is carried out within 5-6 seconds. We put it on charging. If the process has gone, we eliminate the effect of memory (see. Higher). Try to use.

Plan “P”, Dolnia

This plan is effective in the degradation of electrolyte, because during operation there is a process of oxidation with water consumption. And the plan is:

• Microdrel make a hole in the housing.
• Pour 1 cube of distilled water into the hole with a syringe.
• We are waiting for an hour, then “pushing” the element with high current pulses.
• We put it on charging. We are waiting for a day, measure the voltage.
• If the voltage is normal, seal the hole with a sealant or soldering.
• If it fell or the element did not want to take exercises, go to paragraph 2 and do so until there is nowhere to pour water.

If it did not help, then you can read the articles “How to redo the battery screwdriver for 12 or 18 V in the network with your own hands” and “How to make a power supply for a screwdriver”. Still better than throwing a working tool again into the attic.

We found out how to charge a screwdriver battery without a native “charging”. Now, even if the “charger” of your screwdriver burned, drowned, lost or stolen, you will find a way out.

How to charge the Li-Ion screw of screwdriver and other important rules for its operation

• Li.Ion operates optimally in the range from.10 to 45 ° C. Charge at temperatures from 10 to 30 ° C.
• 1 time every 4 months, carry out a full cycle of discharge-rack for calibrating the charge sensor in the battery controllers. That is, discharge to almost 100% and put for charging for 12 hours.
• Store Li-Ion on the charge 40-60%. It is impossible to store charged by 100% Li-andi, since in this case it will forever lose 20% of the container in 3 months. With proper storage-with a charge of 40-60%-Li-Ion will irrevocably lose only 1% of the capacity in the same 3 months.
• If the screwdriver is equipped with two Li-Ion, then charge one up to 40-60% and store it as a backup. Use it as a worker once a month-charge it to 100%, discharge to 40-60% and leave again for storage. The second Li-Ion is the main worker. We have worked. At the end of each day, put it for recharging, even if it is discharged by less than 10%.

Reserve Li-Ion use if the main Li-Ion worker is discharged as a result of intensive work and there is no time to wait for it to charge.

That’s all. Now you know how to charge Li-Ion battery for a screwdriver.

I handed this to every joiner, and I also hung ads in the workshop on the board.

And there may still be a question-why did I switch from Ni-CD to Li-Ion batteries?

Here are the advantages of LI-Ion batteries over NI-CD:

• At least 2 times a large specific container;
• Self.Discharge is several times less;
• Lack of memory effect, which makes it possible to recall at any time;
• It withstands an average of twice as many “charge-discharge” cycles, that is, it will live twice as long.

How rechargeable batteries work

• Li-Ion is subject to aging. Well, and ni-cd eternal or something? They also get old.
• Li-In has low stability when working at low temperatures. All this is in the past. Now Li.Ion is doing such that they work at.10 ° C Stopudovo. And in some sources it is indicated that at.30 ° C can work;
• Li-Ion require the use of only the original charger. Well, what is there? All screwdrivers are sold just with their original item in the kit.
• Li-ion has a high cost. Yes, I wouldn’t say anymore. Recently went to the store. Ni-CD batteries below 1 t.R. Have not seen. And on AliExpress you can buy a whole screwdriver with Li-Ion for 3 tons.R.

Well, finally, if you work with a screwdriver professionally-do not hesitate especially-it will crumble at the same time with the Li-Ion battery. So buy a separate batter separately you do not have to.

Just with a reasonable non-edged use for a couple of years, there should be enough screwdriver.

And, yes, one more important rule. Do not save on the power of the screwdriver. It corresponds to the voltage of the battery. Take a 20-volt minimum. Will twist like a beast.

And buy weak. There will be little sense from it, and there will be no joy from penny savings either.

I generally scored screwdrivers with Li-Ion batteries at 25 volts. The joiners are not loud. Especially after Ni-CD for 14 volts.

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Checking the state of the battery using a multimeter

It will be useful to determine the reason why the battery does not charge. The procedure will reveal the operability of batteries. Here are simple methods in implementation that can be used at home. Prepare equipment: In addition to the multimeter, you will need tools for disassembling the battery (pliers, soldering iron, screwdriver, knife.

• Check the battery on charging, taking readings with an interval of 30 minutes. Voltage should steadily increase to complete charging.
• Quick method for checking the state of battery. Measure U idly. We compare the result with the real voltage and the number of elements vary. The battery has non.Working parts that need to be replaced.

Time until complete charging the screwdriver battery and its main stages

Scurry batteries have 2 main stages of charging:

• The initial phase. After connecting to the electric network of the charger, the current is supplied to the terminals, then it is stabilized by a transistor or resistor stabilizer. The charge recovery current increases to 200% of the capacity of the power element.

• The final phase. After the restoration of the charge is completed, a gradual decrease in the voltage and a decrease in current on the terminals occurs. The final phase can occur when Delta Peak is triggered. The program of automatically termination of charging when the maximum permissible voltage is exceeded. You can adjust the value in many Ni-CD, Ni-MH, Li-Ion batteries.

Each electrical screwdriver includes instructions from the manufacturer. The “charging” paragraph usually indicates the average time to restore the battery charge volume from 0% to 100%. The period may vary depending on the external conditions, such as the charger, the wear and quality of the power element. The indicator on the screwdriver housing begins to burn in green when the tool is charged.

The average time of full charge of the battery of the drill-shurubound is from 30 minutes to 7 hours. Nickel-cadmium batteries are charged for the longest. In more expensive Li-Ion AKB models, fast charging systems are installed. Their volume is completely restored on average in 1 hour of the cycle.

Chargers for screwdrivers are standard and impulse.

• Standard are used for small batteries used at home. They rarely integrate the fast charging system, so the full recovery occurs in 3-7 hours.
• Impulse are able to charge the screwdriver battery in 30-90 minutes. Time to complete recovery depends on the type of nutrition element only indirectly.

The influence of external factors on charging screws of screwdrivers

Regardless of the type of battery, the operating conditions taking into account the influence of external factors do not change:

• It is necessary to charge an element for a screwdriver at a temperature of 10 ° C to 30 ° C. The minimum permissible temperature is 5 ° C, the lower values ​​provoke freezing of the body. Do not wet the charger when working. The contact of the nutrition element with wet objects, rain or snow should not be allowed. Increased air humidity will lead to a decrease in the level of electrical conductivity and breakdown.

• Prevent direct sunlight on the battery, so as not to provoke an increase in the temperature of the case and further overheating. Also, due to exposure to sunlight, metals begin to mutually contact, this gradually reduces the number of charging cycles and discharge. If you do not take into account external factors when restoring the battery charge, then in the near future will lead to breakdown.

Too fast battery charging

The average charging time for a 12 volt screwdriver is 2-3 hours. If the process has accelerated, the battery has decreased the capacity. Naturally this process occurs within 5-7 years, and if the rules for charging are not observed-in 1-2 years.

If the screwdriver does not charge

The reasons that the battery of the screwdriver is not charged, there are several. The problem is the elementary wear of the battery, as well as a violation of the integrity of the contacts of the charger. Then it should be disassembled and bent in the right direction.

Contacts can be oxidized and polluted. Failure to comply with storage conditions will lead to a violation of the charging cycle, the time of restoration of the charge can both increase and decrease. Contacts of the battery and charger must be periodically wiped with special cleaning pastes.

The reason for the failure of the nickel-cadmium and nickel-metall hydride battery may be the effect of memory. If the battery is repeatedly charged before the expiration of energy reserves, then the number of chargers will gradually decrease in it. In the end, a breakdown occurs. Over time, the battery cycles and discharge cycles end. The most durable is Li-Ion type, nickel-metallogids of power has been working for less long.

How much to charge a screwdriver battery

If you have become the happy owner of an electronic cigarette, then you probably may have a question how to charge it correctly and if there are any nuances. In this article we will answer all your questions.

The battery is the most important component of an electronic cigarette. It is this element that determines the life of the entire device. Therefore, if you want to extend the life of your device, you should take the battery charge as responsibly as possible.

General requirements for charging and features of various types of batteries

First, what is useful for charging screws of screwdrivers of any type.

• Full discharge cycle and charge.
• Once a month, better than more, full of category when working tools and a full charge.
• The discharge is performed with breaks with breaks to restore the charge. For every 3 minutes of work. 3 minutes of a break. With this method of discharge, the battery will give the maximum volume of accumulated energy. Therefore, it will be charged in the maximum volume.
• Once every 3 months, training cycles, at least three times, if more, then better.
• The new nutrition element must be discharged and charge at least three times, more better.
• Store in a cool place at temperatures from 5 to 15o.

Each current source has a minimum allowable voltage level at which it is considered 100 % discharged. By discharge of the battery, this refers to the discharge to the minimum acceptable level. Further category. A deep category leads to the beginning of destructive processes. And there is a voltage in which it is considered 100 % charged. The reload of the nutrition element is also harmful. As a result of electrolysis, its chemical components are decomposed. It must be borne in mind that the voltage is indicated for 1 supply element. Screwdriver battery consists of several sequentially connected elements.

The battery may have different voltage: 12 V, 14.4 V, 18 V and others. Therefore, the voltage value with different charge levels are different. For example, in a nickel-cadmium battery (Ni-CD) with a voltage of 12 in the number of elements inside-10 pieces. A fully charged battery has a voltage of 12.5. 13 V. After 50 % discharge, a voltage of 11.5 V (1.15 x 10). The discharged. Voltage 9 V (0.9 x 10).

The voltage must be taken into account when it stabilizes, and not immediately after the end of work by the tool. This is done like this: the voltage is measured on the contacts of the battery immediately at the end of work, then with a frequency of 5 minutes. When the voltage growth stopped, it means that the battery stabilized the level.

Nickel-cadmium batteries (Ni-CD)

Ni-CD Elements of power have appeared in serial production since the middle of the last century. Capable of carrying a very deep discharge. But this does not mean that they need to be discharged to zero by residual voltage.

Nickel-cadmium battery (Ni-CD) have the “memory effect” of the lower discharge value due to irreversible chemical processes. It consists in the fact that if the battery is not completely discharged and charge, it will give as much energy as it received when charging. The effect does not occur immediately, but with regular underference, the decline in the capacity will occur quickly.

It is recommended to charge the battery with a current equal to its capacity. 1 s (where C is the battery capacity). In this case, it will reach the maximum capacity. Regular chargers are charged with a current from 1.0 s to 0.2 s. Further decrease in charging current leads to a decrease in capacity.

And the discharge with small currents, on the contrary, allows the battery to give maximum energy. Therefore, to restore the capacity of the NI-CD source, it is useful to limit the discharge current up to 0.1 s during training cycles. If this is unacceptable due to the lack of time (0.1 with this-10 hourly category), then you need to discharge with a screwed at idle cycles: category, pause, category, pause. The optimal discharge time and pause 3-5 minutes. During the pause, the element will restore the charge. The more he restores and gives, the more he will.

Nickel-metallogid batteries (Ni-MH)

Ni-mh power sources appeared after 1980. The developers tried to reduce the “memory effect” of nickel batteries, and this almost succeeded. However, the self.Discharge of the element has increased by almost 2 times. At the same time, the deep discharge for them has become detrimental. The number of charges-discharge cycles in metric-dimensional less.

You can’t try to reanimate them with a deep discharge. The best way for NI-MH current sources is training cycles with a discharge and charge. With regular use, they will work out much more than charge and discharge cycles than with prolonged storage. Therefore, Ni-MH batteries are used for a professional tool regularly involved in the work. For rare home use, such power sources are not suitable.

Li-Ion (Li-Ion)

Li-Ion Elements appeared after 1990. Their “memory effect” is so insignificant that they can be neglected. But to preserve the maximum capacity, they will also be useful to a full category. In this case, the entire volume of the electrolyte will be involved in the return of energy and its subsequent reception.

For them, the reload, deep discharge and high temperature are unacceptable. Therefore, in all batteries there are controllers that protect against these factors. The nutrition elements of expensive screwdrivers have balancing electronic circuits that allow you to track the parameters of each element and turn it off when deviated from permissible charging values.

You can charge lithium batteries with large currents, up to 2 s. Therefore, the time of their charging is from 30 minutes to 120. Permanent discharge is allowed by current up to 5 s, and impulse consumption up to 50 s. This feature allows them to be overloaded briefly, which sometimes happens during the operation of the power tool. Rated voltage 1 element 3.6–3.75 V, but charged to 4.1–4.2 volts. It is unacceptable to charge above. This leads to a Rapid decrease in the capacity of the nutrition elements.

Charging NI CD batteries

One element has a rated voltage of 1.2V. During operation, this value can change from 1.35V (completely charged) to 1V (full category). These elements have one interesting feature on which the shutdown mode is tied in a charger (if it is automatic). After set of the container, the voltage on the findings is slightly reduced by 50-70 mv. Such a jump is indicated by ΔV (delta v). The charger reacts to such a decrease and cuts off the charge current.

In practice, only charging devices of the middle and advanced level can work on ΔV. And often you have to manually calculate how to charge the NI CD batteries.

Any charging voltage will issue at the rate of 1.5-1.6V to one element. But the charge current can be different. It can always be seen on the charger itself (usually from the back).

The battery capacity must be divided into charge current and multiplied by a loss factor of 1.4. For example:

1000mah/200ma = 5 hours1.4 = 7 hours.

To charge how current? The rated current of the charge is 0.1C, where C is the capacity of the battery. For 1000mah nominal is the current 100ma. The charge time in this case will be 14 hours. Not very comfortable. Accelerated mode of 0.2-0.5 ° C is almost always used. This somewhat reduces the life of the batteries, but increases the convenience of using.

Duration of charging battery

How much to charge a screwdriver battery? It will take to completely charge the battery from 30 minutes to 78 hours, depending on the capacity indicators. Accurate data manufacturers are indicated in the operating instructions. It is recommended to adhere to these recommendations, and not pay attention to the advice of familiar “masters”.

At the same time, most chargers are equipped with special indicators that clearly demonstrate the course of the process. When the battery is charged, it must be removed from the charger to avoid damage.

Types of charging devices

In the kit, one or two battery with a charger is attached to the screwdriver. Now the manufacturers of the power tool have a trend for the sale of products without batteries. This marketing technique forces buyers to purchase models of manufacturers already available in their arsenal. In any case, if the battery is purchased, even separately, you can take it to it. The matter is still in the mechanical design. The charger of one manufacturer is most likely not suitable for charging another.

Almost always, the device for replenishing energy is optimized for a specific type of accumulators, charges it in the most favorable current mode, stops charging automatically at the end of the process. Therefore, when purchasing a charger and batteries of one manufacturer, you can not think about compatibility if the ZU is designed for the battery of the same manufacturer and type.

In most cases, it is sold in impulse performance. But for nickel-cadmium batteries, there are charging devices that are considered professional (appropriate cost). They are called impulso-revervation. For each positive impulse, they give out the release of negative polarity of a small amplitude. This eliminates the memory effect characteristic of the NI CD accumulators and their capacity is maintained.

Is it possible to charge lithium batteries with charging from Nickel cadmiev?

Re: Is it possible to charge Li-Ion batteries for a screw-with ni-cd charging? No, lithium in temperature cannot be charged!

The battery installed in a screwdriver can be checked by a tester or voltmeter, measuring the voltage between the poles. Without load, the voltage will correspond to the idle voltage. So, if for 12 “cans” with a face value of 1.2 in the operating voltage will be 14.4 in, then the idle voltage will increase to 17 in.

How much volts should give out a charger of a screwdriver?

If the NICD battery has a rated voltage of 12 V, then the charger should issue a voltage of about 18 in plus a voltage supply for the regulator in the charger plus some subsidence under the load.

The service life reaches five years. The disadvantages are that nickel.Cadmium batteries are distinguished by large dimensions and weight and with frequent non.Discharge lose part of the container, and this process is called the effect of memory. When storing more than a month, the self.Discharge of the charged battery reaches about 20%.

Security measures

The most important measure of security is not to leave the charged battery unattended. Automation system that controls the parameters of the process, in this case, there is no. Therefore, you will have to manage the procedure manually. This is especially true for lithium-ion batteries. With all their advantages, they are prone to spontaneous combustion in emergency modes, and their chemical composition makes it extremely difficult to extinguish.

If possible, it is also necessary to control the temperature of the charged battery. When it increases, the process should be immediately interrupted. You can measure the temperature with a conventional thermometer. You can also use a contactless meter (pyrometer), a USB termometer with a remote sensor and other methods.

Another simple way of charging is described in the video.

In the absence of a standard source of charging a screwdriver without a native charger, it is possible. But you will have to control the process on your own. Responsibility for the final result is completely on the owner of the screwdriver.