Self-discharge, also known as charge retention ability, it refers to the next in an open state, the battery storage of electricity under certain environmental conditions retention. In general, self-discharge is mainly affected by the manufacturing processes, materials, storage conditions. Self-discharge is one of the main parameters to measure battery performance. Generally, the lower the battery storage temperature, self-discharge rate is also lower, but it should be noted that the temperature is too low or too high are likely to cause damage to the battery unusable.