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I believe the vast majority of consumers have heard that the lifespan of lithium batteries is "500 times". After 500 charges and discharges, the battery will "end its life". Many friends, in order to extend the battery's lifespan, charge it every time the battery is completely depleted. Does this really have an effect on extending the battery's lifespan? The answer is negative. The lifespan of a lithium battery is 500 cycles, which refers not to the number of charges, but to one cycle of charging and discharging.

A charging cycle means the process of all the battery's charge going from full to empty, and then from empty to full, which is not equivalent to charging once. For example, a lithium battery only uses half of its capacity on the first day and then fully charges it. If it continues like this the next day, charging half of it and charging it twice in total, this can only be counted as one charging cycle, not two. Therefore, it may usually take several charges to complete a cycle. Every time a charging cycle is completed, the battery capacity will decrease slightly. However, the reduction in battery capacity is very small. After multiple cycles of charging, high-quality batteries still retain 80% of their original capacity. Many lithium-ion powered products are still used as usual after two to three years. Of course, lithium batteries still need to be replaced at the end of their lifespan.

The so-called 500 times refers to the manufacturer achieving about 625 rechargeable times at a constant discharge depth (such as 80%), reaching 500 charging cycles.

(80% * 625=500) (ignoring factors such as reduced lithium battery capacity)

Due to various impacts in practical life, especially the discharge depth during charging is not constant, "500 charging cycles" can only be used as a reference for battery life.

Life expectancy and influencing factors

Lithium batteries can generally be charged and discharged 300-500 times. It is best to partially discharge lithium batteries instead of completely discharging them, and to avoid frequent complete discharge as much as possible. Once the battery is taken off the production line, the clock starts to move. Regardless of whether you use it or not, the lifespan 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 resistance of the electrolytic cell will reach a certain point, even though the battery is fully charged at this time, it cannot release the stored electricity.

The aging rate of lithium batteries is determined by temperature and charging state.

Temperature charging 40%, charging 100%

98% capacity after one year at 0 ° C, 94% capacity after one year

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

40 ° C, 85% capacity after one year, 65% capacity after one year

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

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