classicsamusaran Li-Ion (xiaomi bm20 3.7v and 804066 3.7V) stored between 3.6 to 3.8v, my home temperature varies between 33-35C. How often should I charge these batteries (weekly, monthly, yearly) to keep them in good condition for long-term storage? If their charge drops too much, they swell or die. AA Ni-MH batteries, storing them empty with zero charge reduces their useful life? If I charged these Ni-MH AA batteries to 100% and stored them at my home temperature varies between 33-35C. How often should I charge them (weekly, monthly, yearly) to keep these batteries in good condition for long-term storage?
