What is the shelf life of a battery?

Answer:

Batteries have a so-called self-discharge. Even if a battery is not used, eventually energy will be lost. The degree of self-discharge is influenced by both internal and external factors, such as weather conditions, storage conditions and battery types. Alkaline batteries have a shelf life of approximately 5 years (self-discharge approximately 2-4% annually) and zinc carbon batteries about 2 years (self-discharge circa 4-6% annually). Lithium batteries have a very low self-discharge and can therefore be kept longer. Rechargeables have a very high self-discharge of 1% per day, but can be recharged when desired. Rechargeable button batteries, finally, have a self-discharge rate of approximately 0,1% per day.

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