How to quickly discharge the battery of an electric screwdriver

What happens if the car battery is completely discharged: Battery deep discharge. What is it? And also the causes and consequences

A quality and reliable car battery is an expensive part of the on-board electrical system. And due to the low-grade fakes from China that filled the market, spending a solid amount on a new battery can be classified as inadmissible wastefulness. But it is not enough to buy a quality product, you need to know how to use it correctly. It is about battery operation this article, namely, whether it is necessary to charge a new battery for a car after buying?


Properly checking your battery before you buy it

First things first: before you buy a battery you must test it. How to do it? There is a simple sequence:

  • Look at the date of manufacture. A car battery is not a battery. Even when it just stands on a shelf in a dry and warm warehouse it gradually uses up the resource allocated by the manufacturer. Less than 6 months have passed since the date of manufacture. it fits, more than 6 months or even a year. you need to look further.
  • Test a new battery with a multimeter and fork. Put the multimeter in constant voltage mode and touch the probe to the battery terminals. The correct value is 12.7V, a little less, such as 12.5V is fine, but no more. The load plug should show at least 9V.
  • Installation on the car. This is the last step, but before installing the battery on the car, make sure that there is no current leakage in the onboard network. If there is no, then start the engine on a new battery should be fast, with a nominal rotation of the starter.

When to charge a new battery?

When charging a new battery is necessary:

    If the electrolyte density in the battery banks is less than 1.24 g/cm3. With this setting the battery charge level varies within 80%. It’s not enough, it’s possible to wait for 1.19 g/cm3 (50% of charge), but it’s better to bring the capacity of the battery to the state of full charge.

Tip:! Car multimeter is a useful tool that every driver should have with him.

How to Install a New Battery in a Car?

A new battery should only be installed at the place of purchase. It’s very common these days for salespeople to do a variety of services, like checking the onboard electrical system for leaks or providing new terminals or installing the battery in the car for free. After installing the battery, start the vehicle to verify the starting system.

If the starter cranks without any problems, the car starts quickly, the speed is smooth and without jumps (if the fuel system is functioning), you can go about your business. Do not forget the warranty card and the packaging of the battery. They’re just what you need in case your battery suddenly stops working.

How to properly charge a new battery

Important! Leaded automobile batteries contain acid, which can seriously harm the health of the motorist. Charge and operate the battery only when wearing protective equipment, such as eyeglasses, rubber gloves, etc.д.

Sequence of charging a new battery:

  • If the battery is serviceable, you should unscrew the plastic covers that cover its banks. At the same time to check the electrolyte level: if the honeycomb is open. add distilled water.
  • Connect the charger terminals to the battery terminals. Be careful not to reverse the connection points: The “plus” of the charger to the “plus” of the battery, the “minus” of the charger to the “minus” of the battery.
  • Turn on the charger and set 6A on its scale. This is the average charging current for any battery.
  • After the electrolyte begins to boil, check the voltage on the leads. If the gauge shows 14,5 V. amperage should be reduced by 1 A.
  • When the total charging capacity is reduced to 2 amps, just wait for 16 volts on the terminals. This indicates the end of the charging cycle.

On average, it will take 10-14 hours to charge the battery. After the cycle, do not immediately screw on the plastic covers of the cans. you should give some time to the battery to “calm down”. It is possible to verify the battery is charged by checking the density of the electrolyte with a areometer immediately after charging.

Charging rules for a maintenance free battery

If everything is clear with the charging cycle of the serviced battery, there are still maintenance-free batteries, which also require periodic attention.

After connecting the battery charger terminals to the battery terminals, turn on the device and set the current strength of 2A. Every 15 minutes you should go over and listen to the condition of the electrolyte in the battery case. At the slightest sign of boiling. reduce the charging current, but do not turn off the charger completely.

If the maintenance-free battery boils, it can lead to its rupture. Many masters in this case say that the battery “shot”. Don’t overdo it with the current of the charger. Four hours of charge time is sufficient for this type of battery. Significantly simplifies the process the indicator installed on the body of many batteries.

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Correct Use and Care of a New Battery

  • Never discharge the battery below 30 percent of its capacity. Just like with smartphone charging it is not advised to go below 20. Now they sell convenient and inexpensive onboard units that display the battery charge. You can install them yourself.

After removal from the car, the battery should stand only in a dry and warm place, other conditions can lead to the beginning of its self-discharge.

Any motorist knows that it is necessary from time to time to service the battery installed in the vehicle, but not everyone knows that it is also necessary to service the new battery before using. Do I need to charge a new car battery?? Why you should charge a new battery? Today we will look at this question.

When you need to charge a new battery?

Many owners of various equipment, whether it is a car, motorcycle, ATV, motorboat, do not realize that the new battery may need to be charged. This is often the fault of incompetent salespeople who say that the battery has been charged at the factory and nothing additional is required. Of course, the manufacturer charges the battery before shipment, but before the battery gets to you, it will still be a few days in storage and a few weeks in the store. During this time, the battery will lose some of its charge as a result of self-discharge and will need to be recharged. Of course, this is not true for those stores whose personnel regularly service batteries before they are sold, but it is not a sufficient condition either. But if you are buying a car, motorcycle, or other vehicle and you buy a March car that was manufactured in June of last year? What do you think the care of this battery has been?

To what voltage the battery may be discharged

There is a concept of a fully discharged battery in order to carry out further operations and discharged to zero, which requires resuscitation. How many volts the battery is discharged depends on the type of model and the number of cells in the battery. Cells are connected in series, the voltage at the output terminals is added together. Therefore, the discharge limit is a different value for acid, alkaline, lithium batteries.

Do I have to fully discharge a new battery pack?? Yes, if it is a Ni-ion or Ni-MH battery. Such batteries have a memory effect. They must be fully discharged 3-5 times before they can be used, then recharged. Any further charging of this type of battery should be done after it has been fully discharged. Only leave the battery fully discharged for storage. How far can you discharge nickel batteries? Bringing the practice cell up to 0.9.1,0 В. Knowing the number of cells, you can calculate for yourself how many volts you need to discharge the battery.

People often ask whether a new lithium-ion battery should be discharged. There is no memory effect in this type of galvanic cell. The device operates steadily at a medium level of charge. So you can charge the battery at any convenient moment with a special charger. Can the lithium-ion battery be fully discharged?? It is possible, but after the discharge below 3.2 V it is necessary to apply special charging techniques, at 2.0 V the cell cannot be restored. A typical deep discharge is 2.5 volts per cell.

How many volts of lead-acid battery can be discharged? With a cell output voltage decrease of 1.70V, the total voltage of a 6 cell battery will be 10.3V. A fully discharged battery will leave a minimum reserve of survivability. Do I have to fully discharge an acid battery?? An unmaintained calcium car battery can be destroyed even after a single deep discharge. All acid batteries are bound to lose capacity after a deep discharge due to plate sulfation.

Different battery types require different maintenance practices. So whether you need to fully discharge the battery, new or in the process of calibration and testing, is written in the instruction manual.


In this article, which we will conditionally divide into three parts, we will consider: types of batteries that are used in screwdrivers (h.1), their possible causes of failure (h.2) and available repair methods (h.3).

The process of discharging the battery of an electric screwdriver

First, disassemble the battery pack and carefully remove the battery pack by first unsoldering it from the other parts of the circuit. Now you need to connect a light bulb to the terminals of the battery with the same voltage rating as the tool. usually 12 or 13 volts. The U and current of your particular electric screwdriver are usually given either in the user manual or on the case of the electric screwdriver.

quickly, discharge, battery, electric, screwdriver

As the lamp heats up, it takes more and more energy from the batteries, and eventually they are completely discharged. When the light goes out completely, it means that the battery is discharged and the “memory effect” can be considered to be eliminated.

Now you know how to properly use this simple method at home and how to discharge the battery of an electric screwdriver without harming the tool itself. If you notice that the nickel-cadmium battery begins to accumulate a “memory effect”, you will always have the option of using a regular light bulb to fully and properly discharge it.

How long to charge the battery of an electric screwdriver?

Before you charge a cordless drill or electric screwdriver, you must determine how long it will take to do so. The period is prescribed in the instruction manual supplied with the tool. Some models have an indicator light that will let you know when the unit is fully charged. Disconnect the battery from the charger immediately after charging is complete.

Typically charges in half an hour to seven hours, depending on battery type and charger. NiCd batteries take the longest to recharge. 3 to 7 hours.

General guidelines for charging the battery

If done properly, the battery will last a long time. Here are the basic principles of properly charging an electric screwdriver:

If the battery is being charged for the first time, it should be fully discharged before use, and then fully recharged.

The temperature in the room should be between 10 to 40 °.

To prevent the unit from overheating, you must disconnect the rechargeable battery (battery) from the charger as soon as it is charged.

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If you do not use your electric screwdriver for a long time, recharge it once a month for preventative purposes.

How to discharge a battery quickly

How long to discharge the battery with normal loads is known. about 7-10 hours if the battery is fully charged. But how can you quickly discharge the battery of a car or electronic equipment?

The battery in a laptop or tablet can be discharged quickly by natural exercise, using games, watching music and video programs. The more applications you run, the more energy the battery loses. Quick Discharge program can be used. The essence of its work is that it starts power-consuming applications, draining the battery.

You can connect the flashlight to a battery that needs to be discharged. You won’t have to wait long for the result. But if the assembly is installed in the case of an electric screwdriver, not to break the connection, you can use a load in the form of incandescent light bulbs, equal in voltage to the battery. In this case, the batteries need to be removed, disconnected from the device, reassemble the circuit, as shown in the photo.

Does it take extra effort and instrumentation to quickly drain a car battery? It is enough if the on-board system will turn on the headlights, the music center or the air conditioner. Power-consuming devices will quickly draw power in a stopped car. But after a deep voltage drop, you must immediately put the battery on line charge.

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How to discharge an electric screwdriver battery with a light bulb

Energy Storage Information Site

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Battery. is a dynamic system that discharges and releases the energy generated during charging. In some cases, the battery must be fully or partially discharged. We will try to explain how to properly discharge acid, nickel-cadmium, lithium batteries for phone, screwdriver, car.

How to quickly discharge a battery

Each type of battery has a lower voltage limit on the terminals, allowing you to charge the device. The device is considered fully discharged, energy is taken up to this limit. So, for car batteries, this figure is 10.8 V, for lithium batteries. 2,5 В.

There are different reasons for discharging a battery. Sometimes this operation is required:

Rapid discharge is always accompanied by intense energy extraction through resistance. But to properly discharge a car battery requires much more resistance than a phone. A car battery can be discharged with a light bulb, while a smartphone uses special apps and applications. Using programs allows you to stop the discharge at the threshold of the allowable voltage.

How quickly the battery discharges depends on the total capacity of the device. The load current must correspond to the technical parameters of the device.

Need to discharge a new battery

There are also budget phone models with nickel-cadmium batteries. This type of cells has a memory effect. So you can recharge it after it’s fully discharged.

Do I need to fully discharge the nickel cadmium battery in my phone? Yes and more than once. You need to do 3 full cycles before you can use your phone. This is called “rocking” the battery. The battery is then fully discharged, but must be recharged each time it is fully discharged.

Most button phones and smartphones come with lithium-ion and lithium-polymer batteries. These items have no memory effect and can always be charged at any charge level. But every 3 months and at the beginning a calibration is done for proper operation of the controller. Do I need to fully discharge the lithium-ion battery on my new smartphone? Especially. no. You can use your gadget from the first minute, discharging it naturally. After disconnecting the device, you need to fully charge it, no matter how long it takes.

What voltage can discharge a battery?

We answer a frequently asked question. Is it possible to completely and uncontrollably discharge the battery? No, this is only done with disposable batteries. Fortunately, many devices have deep-discharge fuses.

Any battery, be it liquid, gel, car, screwdriver or phone, is a dynamic electrochemical system. That means it’s possible to recharge under certain conditions. Retain some of the active ingredient to cause a reverse reaction. This is why it is important to know how many volts you can use to discharge a particular battery.

To discharge the rechargeable battery, you need to take a light bulb with the same voltage indicator as the device. Remove the battery from the cabinet, disconnect it from the device. Connect the terminals to the bulb. Lamp goes out. signal that the battery is completely discharged.

You can quickly discharge your smartphone battery using the free Google Play app and the Quick Discharge app. Suggestions will appear on the display. You can use one or more actions. The current charging time will be indicated on the screen, you need to set the task to the desired charge. You can set the battery capacity to 40% to store the battery and minimize it for calibration.

A car battery is often discharged by a 21-watt incandescent bulb. But at the same time you need to monitor the voltage drop across the terminals. It is much more convenient to use Aimaks B6. universal charger. The critical voltage of the automotive battery is 10.8 V.

How to discharge a battery

The discharge current of any battery is proportional to the capacity. But for every type of battery, there is a minimum spare capacity. The further performance of the battery depends on whether the current used to discharge the device is correct. How to determine the right parameter?

For a car battery, the lower limit is determined according to the number of cans. A minimum of 1.8V is required to determine the battery. For 6 cans it will be 10.8 V. Discharge Current 0.5, 0.7 of Capacity.

For batteries made of nickel-cadmium and lithium-metal hydride cells, the minimum voltage of 1 cell is 0.9 V. Charging current is 0.4 A to 0.1 A. The shorter battery life.

Lithium-ion cells require a threshold discharge higher than 2V. The discharge current should be C. For lithium polymer cells, a 2.5 volt discharge is harmful. Ion batteries use an ionic current of up to 44A. All of these batteries must be discharged from the balancers to prevent one cell from discharging into a restorable discharge.

Here are some helpful visuals on how to properly discharge a battery using a do-it-yourself device

Tools. How do I store my cordless drill batteries?

It looks like your drill has nickel-cadmium (also called nickel-cadmium or nickel-cadmium) batteries. Batteries of this type self-discharge very quickly and will not hold a charge until nickel-metal hydride (NiMH) or lithium batteries (such as lithium-ion or lithium-polymer).

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Matt’s includes lots of technical details on how best to store and maintain batteries. I won’t repeat this information, but I will mention a few very noteworthy points about each of the three battery technologies commonly used for cordless tools.

NiCd is virtually useless when it comes to long-term storage:

A nickel-cadmium battery that is not loaded or charged will self-discharge. About 10% per month at 20°C, up to 20% per month at higher temperatures. Recharging can be done when current levels are high enough to compensate for this rate of discharge; keep the battery fully charged. However, if the battery is to be stored unused for a long period of time, it should be discharged to a maximum of 40% capacity (some manufacturers recommend fully discharging and even short-circuiting once fully discharged) and stored in a cool, dry environment.

You’ll get more recharge cycles with lithium-ion (Li-ion) batteries if you recharge them when they drop to 20% capacity, and as Matt said, you should store them at 30-40% charge.

NiMH tool batteries are not very common in the U.S. Older NiMH technologies had an internal discharge rate of about 3% per month, which is better than NiCd, but not as good as lithium-ion. New nickel-metal hydride batteries have a very low internal discharge rate and can retain charge better for long periods of storage.

What this means in practice, in the real world?

All this talk about storing batteries at 40% charge or refilling lithium-ion batteries at 20% charge is almost purely academic for a variety of reasons. You may have the best intentions to follow the recommendations, but trying to tailor your behavior to battery technology is a headache. The best advice I can give is to simply buy battery technology that doesn’t need a babysitter. In the U.S., it’s probably a lithium-ion battery.Outside of the U.S., it can be lithium-ion or nickel-metal hydride.

As you said in your question, “there are times when life gets in the way” If you can’t devote much time to woodworking on a regular basis, you may not know when you will be using the tool. Again, it’s impossible to know if you should be prepping your batteries for long-term storage.

Some batteries or tools have built-in gauges that show the current battery level. One of my lithium-ion drills has a 3-way indicator, but it’s not particularly accurate. by the time the tool reaches 1 bar, the battery is pretty much dead.If your tools or batteries don’t have accurate charge meters or no meters at all, good luck figuring out if you’re charging your batteries at the right time or keeping your batteries at optimum capacity.

I have drills and other types of devices with both types of batteries that are common in the U.S., nickel-cadmium and lithium-ion.

Every time I went to use my NiCd drill, it would either die, or it would be enough to finish the job. Basically, I had to charge it every time I wanted to use it, and that takes hours.I usually got an unplanned window of time in which I wanted to do something, and that window of availability was used up just waiting for the battery to charge. When I used to use the drill, I would sometimes drain one battery and put it in the charger while I switched to another battery and kept working. By the time I discharged the second battery, the first one was still almost charged. Of course, there are better nickel cadmium batteries and chargers that provide faster charging, but they are not always available for this line of cordless tools.If they are available, they are often not included and must be purchased separately. in which case you could probably just choose a simpler type of battery.

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In contrast, when I go to use my lithium-ion drill, the battery installed in it is always ready to go and has at least some charge, and the second battery is ready to go as soon as the first one runs out Batteries take only 30 minutes to charge and last a long time. Once the first one runs out of juice, I can put it on the charger and I know it will be fully charged by the time the second one runs out of juice.I’ve had the drill (and the batteries) for several years now, and I haven’t noticed any battery degradation.



In short, nickel cadmium batteries require constant babysitting, nickel metal hydride batteries are better, and lithium ion batteries require minimal maintenance.

No batteries work very well in the heat or very cold. I keep my batteries in the garage in the summer and try not to leave them in the car if I need to take them somewhere. If it gets very hot in your store, you can store batteries in a cooler place.In the winter, I store batteries in the house and don’t leave them in the garage or car to keep them from freezing.

If you use your tools every day or even every week, NiCd might help you. If you regularly go more than a month without tools, it’s safe to say that you sometimes go months without tools, and you often need to charge your NiCd batteries before you can use them. In this case, you’re probably best served by lithium-ion or nickel-metal hydride batteries.

Fortunately, many tool lines now offer compatible batteries in both Ni-Cd and Li-Ion types. If you already have a tool with nickel cadmium batteries but the nickel cadmium batteries are not suitable for your work, you can “switch” to a lithium ion battery by purchasing a compatible interchangeable lithium ion battery (and a lithium ion battery charger). or by purchasing a new tool whose batteries are compatible with your existing tool.