Lithium batteries can be recharged 300-500 times. It is best to partially discharge the lithium battery, rather than completely discharge it, and try to avoid frequent complete discharge. Once the battery is off the production line, the clock starts running. Whether you use it or not, the life of lithium batteries is only in the first few years. The decrease in battery capacity is due to the increase in internal resistance caused by oxidation (which is the main reason for the decrease in battery capacity). Finally, the cell resistance will reach a point where, although the battery is fully charged, the battery cannot release the stored charge.

　　The aging speed of lithium batteries is determined by temperature and charging state. The following table shows the reduction of battery capacity under both parameters.

　　Temperature charge 40% charge 100%

　　98% capacity after 1 year at 0°C 94% capacity after 1 year

　　25°C 96% capacity after one year 80% capacity after one year

　　Capacity at 40°C 85% after one year 65% after one year

　　60°C 75% capacity after one year 60% capacity after three months

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