Non-rechargeable Lithium Screwdriver Battery

Non-rechargeable Lithium Screwdriver Battery

Cordless screwdrivers are more convenient to use than network ones. They are characterized by mobility, independence from the presence of an outlet "at hand", the length of the cord. The only drawback is that you need to monitor the charge level for timely recharging. But not all types of batteries allow you to do this, and at the most inopportune moment, the screwdriver stops working. And, unfortunately, there comes a time when the battery stops charging.

Battery Types

There are three types of tool batteries:

  • Nickel Cadmium (NI-Cd). The older generation, which is still equipped with household screwdrivers. Affordable price, good size-to-capacity ratio (compact enough), keep the charge inoperative for a long time. The disadvantage is the memory effect. If it is recharged without a full discharge, then "information" about the incomplete volume is accumulated, it prevents the charge from being given up until the actual resource is exhausted.
  • Nickel Metal Hydride (Ni-Mh). An advanced analogue of nickel-cadmium batteries with cleaner production technology. The memory effect, although present, is weaker. The main disadvantage is that they are quickly discharged during storage.
  • Li-ion. The most advanced type, which is gradually replacing other types in the segment of professional / semi-professional electric hand tools. High capacity, almost complete absence of "memory", durability, low level of self-discharge in storage mode. The only drawback is the high cost compared to other analogues.
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Important! The price of a "can" of nickel-cadmium type with a capacity of 2 Ah is approximately two times higher than the "can" of a lithium-ion type.

Video: Non-rechargeable Lithium Screwdriver Battery

Why the screwdriver’s battery does not charge. causes and solutions

The reasons for the absence or weak charge level, as well as methods for troubleshooting, are different:

  • There is no contact between the terminals of the charger and battery. This is due to the fact that the memory plates are bent. Gently bend the plate, returning to working condition.
  • Oxidation of the terminals or sticking of dirt on them. The contacts are cleaned and wiped with alcohol.
  • Failure of one of the "cans". Disassemble the battery case by removing the cover (unscrew the screws or remove the latches). "Call" each jar of the tester for the presence of voltage or discharge current. With voltage it is simpler. it is either there or it is not, but this method does not always work. The discharge current is measured on a load resistor. for a faulty bank it is an order of magnitude lower than for a healthy one. After diagnostics, the faulty jar is separated from serviceable, and a new one is installed in its place, of exactly the same type, and with the same polarity orientation relative to the remaining elements.
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Important! The most difficult moment to replace the cans is to solder the cans into the battery. The factory uses spot welding, and when repairing "do it yourself" more often. a soldering iron. During operation, it is important not to overheat the battery, you need to work quickly.

There is another reason for the lack of charge, but it is typical only for nickel-cadmium batteries. the memory effect has worked, and the battery does not charge, although its life has not yet been exhausted. In order not to bring this up, it is important to properly charge.

How to charge the battery correctly

When you purchase a new tool with a nickel-cadmium or nickel-metal hydride battery before use, it is fully discharged three times and charged (pumped). When using a screwdriver, the battery is not charged until it is completely discharged. Then pumping is repeated periodically as a preventative measure.

Important! To avoid downtime, you need to have a spare battery.

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Upon reaching full charge, Ni-Mh and Ni-Cd batteries are disconnected from the mains (for lithium-ion, this is done by the controller). During a long break in operation, the battery is removed and stored separately from the screwdriver.

When handled carefully, following the manufacturer’s instructions, the battery will last a long time and will not require early replacement. A minor repair can be done with your own hands.

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