How do I store a lithium-ion battery for several months?

Charge the battery ideally to 50-75% and keep the battery in a cool dry place for no longer than 3 months. Temperatures below 15°C are favourable. The fridge in an airtight container is a good option.
Extreme example: Storage of a fully charged lithium-ion battery at 30°C (direct sunlight) irreversibly damages the battery – it may even fail completely.

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