Lithium battery has a bad characteristic -- self discharge. Self discharge is related to voltage (the charged electric quantity, i.e. the saturated state of charging). Therefore, the long-term storage of lithium battery should be charged with a certain amount of electric quantity, while the capacity of lithium battery will be lost in the process of storage (the effectiveness of lithium battery). The amount of charged electric quantity and storage temperature of lithium battery will affect the capacity of lithium battery. The following are different Temperature and battery full state, remaining capacity of lithium battery after one year storage:

Storage temperature - 40% state of charge - 100% state of charge

0 degree -------- 98% ------------- 94%

25 degrees -------- 96% ------------- 80%

40 degrees -------- 85% ------------- 65%

60 degrees -------- 75% --------- 60%

It can be seen that the higher the storage temperature and the fuller the battery charge, the more severe the capacity loss. Therefore, long-term storage of lithium-ion batteries is not recommended. If users have idle batteries in their hands, the storage conditions recommended by experts are that the charging level is 40%, and the storage temperature is lower than 15 ℃ or lower.