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How to use NiCd and NiMH accumulators in proper way?

  1. Use only accumulators suitable for your appliance and your charger. Mind right accumulator polarity. Avoid short-circuit while storing it.

  2. The best way of storing NiCd accumulators is in discharged condition, but NiMH accumulators in charged condition. The both types of accumulators are recommended to be stored in dry environment at indoor temperature.

  3. Charge the NiCd accumulators just before their use. Always use corresponding charger. New accumulators or long stored ones reach full capacity only after several charging and discharging. If possible, after long time storage, charge accumulator for 14–16 hrs applying the current intensity corresponding to one tenth of nominal capacity.

  4. Before charging, the temperature of accumulator should be at the level of indoor temperature. Charging the accumulators whose temperature is lower than 15° C or higher than 30° C causes decreasing of the capacity in next cycle. Temperature increasing from 0° C to 15° C takes 2 hours in the indoor temperature conditions. The temperature must be stabilized inside the accumulator not only on its surface. Charging the accumulator with the temperature below freezing point causes leakage of hydrogen through the accumulator safety valve and getting atmospheric oxygen into the accumulator, which causes self-discharge of the accumulator. Although the accumulator is fully charged, after a few days it is absolutely discharged.

  5. In common use, the life of service of NiCd accumulators is about 1,000 cycles and 500–700 cycles in case of NiMH accumulators.

  6. While storing, accumulators self-discharge. Self-discharging is about 30 % of capacity a month in the indoor temperature conditions. Increasing of the temperature causes the increasing of self-discharging.

  7. Do not replace only one cell or a part of accumulators in defective battery. Always replace the whole accumulator set so that the accumulators can be of the same production run.

  8. In routine operation of accumulators, "memory effect" does not occur. This effect is very often confused with the result of overcharging that causes decreasing the accumulator capacity in consequent cycle and decreases the accumulator life of service.

  9. Do not connect anything to the accumulator by means of soldering so that not to break the safety valve of accumulator. Use accumulators with soldering tape only.

  10. Do not burst open accumulators or mechanically waste them. Do not put them into the fire or expose them the high temperatures. Do not throw away out of service accumulators into the domestic waste.

  11. The accumulators are produced for the use at high temperatures, for heavy extraction flow, for permanent charging, with increased capacity, etc. You should consult the suitable type of accumulator with regard to a required application.

  12. If you have a few accumulators in one set, keep the final discharging voltage of 1 V per a cell. Otherwise the polarity of one cell could be changed, which would cause the leakage of electrolyte, resulting in the permanent decreasing capacity of the whole set. It most often happens with the mobile telephone, children cars, accumulator tools and hand flashes.

  13. Always use adequate type of chargers for charging accumulators and accumulator batteries. The chargers that are fitted with temperature control (thermistor inside the battery or the method "delta T/delta t) or with the voltage level control at the end of charging (method delta V or d2V/dt2") can be only used for partly discharged accumulators without effecting the life of service or capacity in the following cycle. On the contrary, the life of service of the accumulator batteries discharged only partly and charged again, using one of the methods mentioned above, is significantly longer than the life of service of the batteries 100 % discharged. (The mentioned methods are used for GSM phones chargers as well as Hands-free sets and for portable radio sets chargers and accumulator tools.).

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