Lithium-ion batteries can only be charged and discharged 500 times?

　　I believe most consumers have heard that the life of lithium batteries is "500 times",500 times charge and discharge, more than this number, the battery will "end of life", many friends in order to be able to extend the life of the battery, each time when the battery is completely exhausted before charging, so the battery life really has an extended effect? The answer is no. The life of the lithium battery is "500 times", which is not the number of charges, but a charge and discharge cycle.

　　A charging cycle means that all the power of the battery is used from full to empty, and then from empty to full, which is not the same as a charge. For example, a lithium battery uses only half its power on the first day, and then it is fully charged. If it is still the same the next day, use half of the charge, a total of two charges down, which can only be counted as a charging cycle, not two. Therefore, it may usually take several recharges to complete a cycle. After each charging cycle, the battery capacity is reduced a little. However, this power reduction is very small, high-quality batteries after multiple cycles, will still retain 80% of the original capacity, many lithium power supply products are still used as usual after two or three years. Of course, lithium battery life is still needed to be replaced after the final.

　　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 charging cycles.

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

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

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