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•When the light becomes weak during using, that means the battery is in lack of power. At this moment, stop using it and recharge it in time so as to protect the battery. Recharge it before the light is completely invisible, otherwise it would damage the battery.•Frequent use is required, long-time none use is unadvisable. if you don’t use it very often, please recharge it every 3 months, or the battery’s life-span will be shortened.