Lithium-ion battery are fire hazards, so How should we store the lithium batteries ?
In general, Lithium ion batteries (Li-ion) should not be stored for longer periods of time, either uncharged or fully charged. The best storage method, as determined by extensive experimentation, is to store them at a low temperature, not below 0°C, at 40% to 50% capacity. Storage at 5°C to 15°C is optimal. Since lithium batteries self-discharge, it is recommended that they must be recharged every 12 months.
We can further divide it into short-term storage and long-term storage.
Short-term storage: Store the battery in a dry place with no corrosive gases and a wet temperature between -20℃-35℃, higher or lower temperature will cause the metal parts of the battery to rust or the battery to leak.
Long-term storage: As long-term storage will cause the battery activity passivation and accelerate the self-discharge rate, the ambient temperature should preferably be between 10℃-30℃, in addition, it is necessary to do a charge/discharge cycle every 3 months to maintain its activity and recovery performance.
Charge 40% to 50% of the battery charge, and refrigerate in a dry environment. Cooler temperatures and less charge is conducive to maintaining the life of the battery, but too little charge can not be, because the battery will be self-discharge in storage, once the battery slowly run out of power, it will seriously shorten the battery life.
The extent of the effect can be referred to the following relationship between the storage temperature of lithium batteries and the rate of permanent loss of capacity.