Lithium-ion battery can only be charged and discharged 500 times?
I believe that most consumers have heard that the life of lithium batteries is "500 times", and 500 times of charging and discharging. After this number of times, the battery is "end of life". Many friends in order to extend battery life Charging only when the battery is completely exhausted, does this really extend the life of the battery? the answer is negative. The life of a lithium battery is "500 times", which does not refer to the number of charges, but a cycle of charge and discharge.
A charging cycle means that the battery is fully charged to empty, and then from empty to full, which is not the same as a single charge. For example, a lithium battery used only half of its power on the first day, and then fully charged it. If it is the same the next day, that is, half the charge, and a total of two charges down, this can only be counted as one charge cycle, not two. Therefore, it may usually take several charges to complete a cycle. Every time a charging cycle is completed, the battery capacity decreases a bit. However, the reduction in power is very small. After high-quality batteries are charged for many cycles, they will still retain 80% of their original capacity. Many lithium-powered products will still be used after two or three years. Of course, after the end of the lithium battery life, it still needs to be replaced.
The so-called 500 times means that the manufacturer has achieved about 625 recharge times at a constant discharge depth (such as 80%) and reached 500 charging cycles.
(80% * 625 = 500) (ignoring factors such as reduction in lithium battery capacity)
However, due to various influences in actual life, especially the depth of discharge during charging is not constant, the "500 charging cycles" can only be used as a reference battery life.