How to store nickel cadmium batteries for screwdrivers

Storage of nickel-metal hydride batteries from screwdrivers

Preservation of this type of battery is recommended at temperatures of no less than ten degrees Celsius. Despite their considerable capacity and excellent performance, it is recommended to observe this requirement of battery storage.

In order to achieve the maximum storage effect it is necessary to charge the battery fully from time to time (for example, once every six months). It should be noted that in contrast to the lithium-ion batteries, rechargeable Ni-MH batteries require one hundred percent charging during their storage.

Using a multimeter to check the condition of your battery

Not always when the battery quickly sits or does not function at all, it is necessary to buy a new or carry the unit to the specialists of the service center. The cause of the fault can be found independently in many cases, even by an inexperienced electrician, familiarizing himself with the search algorithm. To do this, you will need to use a multimeter or similar measuring instruments. In addition to this device, you will also need the following tools:

In order to pinpoint the exact cause of a battery malfunction, you’ll need to determine how each individual cell is functioning. But first it is recommended to check the charger. With the help of a multimeter it is done in this way:

  • turn on the device;
  • set the switch of the multimeter measuring values to constant voltage;
  • place the probes in the corresponding sockets of the multimeter and touch them to the contacts (“” and “-“) of the charger;
  • compare the value displayed on the device with the battery charger output voltage indicated in the instruction manual or on the case;
  • If the values do not match, then repair the adapter or buy a new one.

Whenever possible, select the measuring range on the instrument used that is closest to the output voltage indicated on the charger.

To check the battery of an electric screwdriver using a multimeter, proceed as follows

How to revive dead NiCd battery from cordless power tools

  • charge the battery pack fully;
  • check the battery output voltage with the multimeter by setting the switch of the device to its constant value and touching the plus and minus with the probes;
  • if it is found that the measured value does not correspond to the value indicated in the instruction manual, the battery pack is disassembled and all batteries are removed;
  • When there are no damaged banks (leaked or bloated), then check the voltage at the terminals of each battery using a multimeter, beforehand using a soldering iron to unsolder the circuit;
  • in turn connect the load to the cells for the same time (for example, a light bulb of the appropriate voltage);
  • on which battery the biggest drawdown occurred, that is the damaged one.

To test the nickel-metal hydride and nickel-cadmium energy storage batteries, they are discharged completely to avoid the “memory effect.

When testing the batteries, please note that for nickelcadmium and nickel-metal hydride types of batteries the output voltage should be between 1.2 and 1.4 V, and between 3.6 and 3.8 V for lithium batteries.

If you find a defective battery, you can replace it with a new one or try to repair it temporarily by adding distilled water or by applying high voltage. You can also measure the current with a multimeter: if it rises and exceeds 1 A in the first hour, then the battery is considered to be functional.

Read also: Show how to make a pipe bender

If there is no voltage at the battery’s output, there is a high probability that the circuit inside the unit has been broken. This also disassemble the unit and look first visually, and then with the help of a multimeter the place of the breakage.

When starting to use a new cordless electric screwdriver, it is necessary to carefully study the instructions for use of this product, enclosed by the manufacturer. It is necessary to take into account the peculiarities of the battery type installed on the power tool in order to charge it correctly, as well as to store it for a long time. Following simple recommendations will prolong the life of the battery until it is completely exhausted. When there is no brand-name battery charger, then the following alternative ways of charging will temporarily help.

If the battery capacity drops, reduced operating time on a single charge, you can repair them with your own hands. To do this, just set the value of the output current or voltage with a multimeter and compare their compliance with the normative values of these parameters.

Lithium-ion battery-powered power tools have been a part of our lives for a relatively long time. Gradually, electric vehicles are becoming a common means of transportation. Including for photographers. In the cities it is convenient to move around on an electric scooter, in the countryside on an electric bike. Sports photographers are not interested in, we need a comfortable and not fast movement, when you can safely look around in search of subjects.

And since a significant percentage of the price of all of these wonderful and useful vehicles are lithium-ion batteries, you need to make sure that they last as long as possible.

Lithium-ion batteries begin to degrade immediately after being made. Long-term storage without deterioration of the characteristics of lithium-ion batteries is not possible. The problem with these cells is that, unlike lead-acid batteries, they do not like to be stored more than a few months fully charged. They should be stored at 40-50% of the charge. Storing lithium-ion cells at 100%.long time accelerates their degradation process. Another important point is that half-discharged batteries do not explode.

It is advisable to store the batteries at 58 degrees Celsius. The relative humidity is not very important, about 50% is recommended. If condensation can occur, it is recommended that batteries be stored in a plastic bag. Self-discharge is not a big problem as long as the lithium-ion battery is not left unattended so long that it fully discharges. In this case it can simply be thrown out. Every 6 months or so you should check your batteries and charge them to 40-50%. When charging to this level, it is easiest to use a timer. If you have a 10 Ah battery and you need to charge it by about 20% with a 2 Ah charger, this means you have to charge it for about an hour (charger 2 Ah / 2 Ah = 1 hour).

Approximate loss of capacity depending on the level of charge and temperature conditions during storage of the battery is shown below:

0°C. capacity loss when storing the battery with 40% level of charge. 2% / year 25°C. capacity loss when storing the battery with 40% level of charge. 4% / year 40°C. capacity loss when storing the battery with 40% level of charge. 15% / year 60°C. capacity loss when storing the battery with 40% level of charge. 25% / year

0°C. capacity loss when storing the battery with a full charge. 6% / year 25°C. capacity loss when storing the battery with a full charge. 25% / year 40°C. capacity loss when storing the battery with a full charge. 35% / year 60°C. capacity loss when storing the battery with a full charge. 40% / year

Above are the “average” recommendations. Lithium-ion battery manufacturers give more accurate information about storage. So LG Electronics writes the following about storing 18650 2500 mAh batteries:

If you need to discharge the battery on an electric bike, it’s best to do so under load. It is risky to put the bike on a stand and turn the wheel when you are not using it, because this will cause the motor to overheat.

Charging bulk batteries for electric vehicles is best done in a wood stove, fireplace, or modified ammo box (20 But you can also do it in the garage if you don’t have a country house. Smoke from a lithium fire is incredibly toxic, and it can damage everything in your home.

What’s the best battery for an electric screwdriver

Cordless electric screwdriver. it is quite convenient and in demand tool. Independence from the mains makes this device mobile and allows you to work in hard-to-reach places. But despite all the advantages, the battery pack (battery) is the weak link in an electric screwdriver. Therefore, choosing a power tool, you must first understand what kinds of batteries exist, what their difference is, the pros and cons of different types of batteries.

What battery is better for an electric screwdriver. lithium or cadmium??

A drill, an electric screwdriver. tools necessary in everyday life. It will be useful to buy them for everyone who is engaged in home improvement with his hands. Also for craftsmen and professionals screwdrivers are now indispensable. And since in construction tool stores the choice is huge, many people may have reasonable questions: what tool is better to choose and what battery is better for an electric screwdriver? a lot depends on the choice of battery: first of all, the mobility of the tool and the duration of its work in off-line conditions. Before finally deciding which batteries are most preferable in one case or another, it is necessary to become more familiar with what kind of batteries are used in screwdrivers.

How to Choose an Electric Screwdriver

In principle, screwdrivers can be divided into two types: mains and rechargeable. The first works only with the mains, the second with the battery. Since the most popular are the second type of screwdrivers, let us first consider how to choose a cordless electric screwdriver and its main features.

ErgonomicsCurrent ratingNumber of speedsVoltage and battery capacityRate of charge and duration of workLength of storage in an idle positionBattery typeBattery costAdditional fittingsA network electric screwdriver

The following features should be considered when selecting a cordless electric screwdriver:

OGT 31. Nickel Cadmium Off Grid Batteries

  • ergonomics,
  • torque,
  • number of speeds,
  • battery voltage and capacity,
  • battery type,
  • battery cost,
  • accessories.


Difference between Ni-Cd and Li-Ion or Ni-Mh sources

Batteries with active components including nickel and cadmium have a number of differences from more modern lithium-ion and nickel-metal hydride power sources:

  • Ni-Cd cells, unlike Li-Ion and Ni-Mh variants, have a memory effect, have a lower specific capacity for the same size;
  • NiCd sources are more unpretentious, maintain operability at very low temperatures, many times more resistant to overcharge and strong discharge;
  • Li-Ion and Ni-Mh batteries are more expensive, afraid of overcharge and heavy discharge, but have less self-discharge;
  • the service and storage life of Li-Ion batteries (2-3 years) is several times shorter than that of Ni Cd products (8-10 years);
  • nickel cadmium sources lose capacity very quickly when used in buffer mode (for example, UPS). Although they can be fully restored afterwards by deep discharging and recharging, it is better not to use NiCd products in applications where they are constantly being recharged;
  • the same charging mode for Ni-Cd and Ni-Mh batteries allows the use of the same chargers, but it is necessary to consider the fact that Ni-Cd batteries have a more pronounced memory effect.

Based on the differences, it is impossible to make a definite conclusion about which battery is better, since all elements have both strengths and weaknesses.

Li-ion batteries

We dismantle the control board. In its place we need to install the working board. The one we remove from another unit of the same type.

Then we remove the individual batteries and test them. Using an adjustable power supply, we apply 4 V to each of them with a current of 200 mA. A unit should be considered serviceable if there is an increase in voltage.

When the battery is not functioning because one cell has failed, it is not difficult to establish this. But there are other problems with this type of battery.

Lithium-ion batteries have a standard technology feature: They decompose the charge carrier. Therefore, despite the fact that there is no memory, as well as a stable set of voltage limit, under normal operation after 3 years, the capacity of the product decreases by a factor of two.

Sometimes there is another problem: the power units are out of balance. This can be understood by the fact that the useful capacity gradually decreases. As for the operating time of an electric screwdriver.

IMPORTANT! You become aware of an imbalance only after you disassemble the battery. All power units are removed. It is best to do this after the battery is fully charged. Every battery needs testing. When the voltage on some is less than the rest, then eliminate the imbalance.

There are all sorts of charger options on the market that can fix an unbalanced group of lithium-ion batteries. However, in everyday life, the cheap method where each element is charged separately is more suitable.

It makes sense to find information from the manufacturer about what the rated current and charging time are. With an adjustable power supply you can discharge the elements so that they have the same level.

How to store the battery from an electric screwdriver

The screwdriver is a household essential power tool. For ease of use, many models have built-in batteries that allow you to perform work in standalone mode.

store, nickel, cadmium, batteries

If you don’t use the screwdriver often, you need to properly store the rechargeable power supply. About the peculiarities of this operation, depending on the type of battery, will be described in detail in this article.

Ni Cd (Nickel Cadmium Battery)

Appeared and began to be produced before the other types

Capable of remaining functional from approx.50 to 40 degrees Celsius, with the ability to charge at sub-zero temperatures.

Number of recharging cycles from 100. 900 to 2000, depending on the manufacturer’s technology

They have the memory effect, so it is recommended to train them, after the acquisition or prolonged storage, for 3 to 5 cycles, completely discharging and charging the batteries (the manufacturer’s recommendations should be followed), the subsequent observance of the cycles, will allow to maintain the working parameters in the best way.

Self-discharge rates can be as low as 8. 10% for the more recent versions or 20.30%, for older versions, of the original capacity.

Can be stored uncharged, in which case they are “immediately” ready for use after charging.

weight, with relatively similar dimensions to NiMh

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