How long is the service life of the 18650 power lithium battery?

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    At the beginning, the life of the 3.7V 18650 lithium battery could reach about 500~1000 times, and the life of the 3.2V 18650 could reach more than 2000 times. Of course, the premise is that the qualified battery produced by the regular manufacturer, if it is a defective product or a mixed battery, the life will be very short.
    The service life of 18650 lithium batteries is only two to three years. Individual lithium batteries may be charged and discharged 300-500 times.The lithium battery is partially discharged instead of completely discharged, and frequent complete discharges should be avoided as much as possible.Once the battery is off the production line, the clock starts to move around.Regardless of whether you use it or not, the service life of lithium batteries is only two to three years.

    The life span of 18650 lithium batteries is 300 to 500 charging cycles.Assuming that the power supplied by a full discharge is Q, if the current power reduction of each charging cycle is not considered, the lithium battery may supply or make up for a total of 300Q-500Q of power during its life.From this we know that if you use 1/2 to charge each time, you may charge 600-1000 times; if you use 1/3 to charge each time, you may charge 900-1500 times.
    And so on, if you charge randomly, the number of times is uncertain. A saying that people often hear is that the life of a lithium battery is 500 times; the number of times in the sense of lithium battery principle; refers to the cycle life, that is, a complete charge and discharge cycle. The test method in the industry is: discharge depth × number of charges = cycle life, numerically the discharge depth is 80%, at least 625 times of charge and discharge, that is, 80%×625=500 (times).
    In short, no matter how you charge it, it is constant to make up for a total of 300Q~500Q of power.Therefore, we may also understand this way: the life of a lithium battery is related to the total charging power of the battery, and it has nothing to do with the number of charges.The effect of deep discharge and deep charging on the life of lithium batteries is not much different from that of shallow discharge and shallow charging.
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