I believe the vast majority of consumers have heard that the lifespan of lithium batteries is "500 times", with 500 charges and discharges. Beyond this number, the battery will "die". Many friends, in order to extend the lifespan of the battery, charge it every time the battery is completely depleted. Does this really have an effect on extending the lifespan of the battery? The answer is no. The lifespan of a lithium battery is "500 times", which refers not to the number of charges, but to a charging and discharging cycle.

　　A Charge cycle means that all the power of the battery goes from full to empty, and then from empty to full, which is not the same as charging once. For example, a lithium-ion battery only uses half its capacity on the first day, and then fully charges it. If it is still the case the next day, that is, use half of it to charge, and charge it twice in total, this can only be counted as one Charge cycle, not two. Therefore, it may usually take several charges to complete a cycle. The battery capacity will be reduced a little after each Charge cycle. However, the reduction in battery capacity is very small. After multiple cycles of charging, high-quality batteries still retain 80% of their original capacity, and many lithium-ion powered products are still in normal use after two to three years. Of course, lithium-ion batteries still need to be replaced after their lifespan reaches the end.

　　The so-called 500 times means that the manufacturer has achieved about 625 rechargeable times at a constant discharge depth (such as 80%), reaching 500 Charge cycle.

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

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

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