Over time, your battery loses capacity, partly due to self-discharge. However, you can maximize your battery’s lifespan by storing it correctly.
You should store your battery in a dry, well-ventilated place that is protected from moisture and sunlight, at a temperature of approx. 10-20°C. The optimal storage temperature, which prevents or slows down the battery’s aging process, is a constant 10°C. Make sure that you store the battery on a flat and stable surface. If you need to charge your battery, you should do so under the same conditions.
Be careful not to store the battery at “full charge” or “empty”: this will cause it to wear out faster.
Also, avoid temperatures below zero and above 40°C. Storing the battery for just two hours at these temperatures can already damage the lithium-ion cells of your battery.