Batteries have a shelf life. For example, they may come with about 300 charge capacity. This means that a charge is counted only if the battery charged after the "battery empty" switch-off. However, if the battery is charged without it getting completely drained, then that does not account for a charge. Therefore, a battery that has a 300 charge capacity can only be optimally used for so many times after the battery is completely drained out.
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