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Lithium-ion batteries can only be charged and discharged 500 times?
- Feb 27, 2019 -

I believe most consumers have heard that the life of lithium-ion batteries is "500 times"。 More than 500 times of charging and discharging, the batteries will "die"。 Many friends in order to prolong the life of the batteries, they charge the batteries every time when the battery is completely exhausted。 Does this really prolong the life of the batteries? The answer is No。 The life of lithium batteries is "500 times", not the number of charges, but a cycle of charge and discharge。


A charging cycle means that all the power of the battery is charged from full to empty, and then from empty to full, which is not the same as charging once. For example, a lithium-ion battery uses only half of its power on the first day and then charges it. If that happens the next day, that is to say, charge half of it and charge it twice in total, it can only be counted as one charging cycle, not two. Therefore, it may take several charges to complete a cycle. With each charge cycle completed, the battery capacity will be reduced a little. However, this power reduction is very small, high-quality batteries will retain 80% of their original capacity after many cycles of charging, and many lithium-ion power supply products will still be in use after two or three years. Of course, the life of lithium-ion power still needs to be replaced in the end.


The so-called 500 times, refers to manufacturers in a constant discharge depth (such as 80%) to achieve 625 times or so of rechargeable times, up to 500 charging cycles.


(80%*625=500) (ignoring lithium battery capacity reduction and other factors)


However, due to various influences of real life, especially the discharge depth during charging is not constant, so "500 charging cycles" can only be used as a reference battery life.


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