When lithium batteries are left unused for extended periods, proper storage methods can effectively extend their lifespan and prevent premature failure due to improper handling. Below are guidelines for maintaining charge levels and charging cycles during idle storage:
01.Battery Level Maintenance Range
It is generally recommended to maintain lithium battery charge levels between 40% and 65%. For example, in the standard 4.2V lithium battery voltage system, the corresponding voltage range is approximately 3.7V to 3.9V. For long-term storage (over 6 months), charging to 50% to 70% capacity is also a suitable option.
02.Charging cycle
Due to the self-discharge phenomenon in lithium batteries, prolonged periods without charging may result in excessively low power levels, causing irreversible capacity loss. Therefore, regular charging is necessary. Most resources recommend charging every three months. However, if the battery capacity is small or the storage environment has higher temperature and humidity, the self-discharge rate will accelerate, potentially requiring shorter charging cycles.
Common Misconceptions Corrected
1.Store with a full charge to prevent power loss
Wrong! Storing batteries fully charged accelerates cathode material degradation and thickens the SEI film, shortening battery life.
2.When not in use for extended periods, discharge the battery completely before storing.
Wrong! Over-discharging (<10%) causes lithium plating on the negative electrode, permanently damaging the battery.
3.Just put it in the trunk/on the balcony. No need to worry about it.
Wrong! Extreme temperatures—whether scorching heat (trunk temperatures can exceed 50°C in summer) or freezing cold (balconies can freeze solid in winter)—will accelerate battery degradation.
Post time: Sep-02-2025