1, see if the charger data cable is damaged.
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2. See if the socket is powered.
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3, is the phone battery aging. Charge overnight, many people like to charge before going to bed, but some people think that this will lead to overcharging of the mobile phone, so that the battery storage capacity is reduced, now the mobile phone is equipped with overcharging protection, the mobile phone is fully charged automatically power off, there will be no overcharging at all, the mobile phone is quickly full, it will automatically convert to trickle charging, charging is very slow and the current is very small. It's not easy to overcharge.