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检查充电宝的LED灯,判断是否需要充电。
虽然充电宝随时都能充电,但是不必要的充电会缩短设备的使用寿命。大多数充电宝的一侧都有4个LED灯。电量减少时,灯就会熄灭。等到只剩一两个灯的时候再给设备充电。
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