rechargeable lithium battery cylindrical 18650 21700 lipo polymer ion monthly self discharge rate depends on battery material

Lithium battery self discharge means that battery will discharge at small scale even though battery electrode are not connected and no load to battery.

NCM (Nickel cobalt manganese mixed, normally NCM 532 or NCM 523) self discharge rate is 0.8mV per day.

For IMR pure manganese material battery, mostly 18650 600mAh 800mAh 1000mAh 1200mAh, capacity will drop to 90% after 6 months.

It is better to recharge your batteries every 3 months if they are stored in warehouse for long time. Storage ambient temperature and humidity is also important to batteries, colder environment is better as it will slow down chemical reaction. The best is to store battery in cool and dry area, 10°C to 25°C.

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