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Lithium Battery, Polymer Lithium Battery Life Knowledge

Oct 26, 2019

lithium battery, polymer lithium battery can only charge and discharge 500 times?

        I believe that most consumers have heard that the life of  lithium battery and polymer lithium battery is "500 times", 500 times of charge and discharge. More than this number of times, the battery will be "end to sleep", many friends in order to extend the battery Lifetime, every time the battery is fully discharged, does it really extend the life of the battery? the answer is negative. The life of a lithium battery is "500 times", which means not the number of times of charging, but a period of charging and discharging.

       A charge cycle means that all of the battery's charge is from full to empty, and then from empty to full, which is not the same as charging. For example, a lithium battery used only half of its electricity on the first day and then fully charged it. If it is still the next day, it will be charged in half, and it will be charged twice in total. This can only be counted as one charging cycle, not two. Therefore, it is usually possible to complete a cycle after several charges. The battery capacity is reduced a little every time a charge cycle is completed. However, this power reduction is very small. After a high-quality battery has been charged for many cycles, it still retains 80% of the original capacity. Many lithium-powered products are still used after two or three years. Of course, the life of the lithium battery still needs to be replaced after the end. The so-called 500 times means that the manufacturer has achieved 625 times of chargeable times at a constant depth of discharge (such as 80%), reaching 500 charge cycles. (80%*625=500) (ignoring factors such as lithium battery capacity reduction) Due to the various effects of real life, especially the depth of discharge during charging is not constant, "500 charge cycles" can only be used as reference battery life. 

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