It may be due to the fault of the phone system, the fault of the charger, or the poor contact between the charger and the phone.
Solution: It is recommended to change a set of charger to try charging again, generally can be solved. If it is not deliberately borrow the charger, the charging bank\/computer usb interface can also be a guest charging head at this time, and the data cable is prepared one or two times a day. If you rule out the charger problem, then go to the phone's official after-sales store.
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Extension: There is current, but no voltage. The phone senses a current input and begins to display a reminder that it is charging. But in fact, the current power can not reach the floor to charge the battery, so the result of the withdrawal is to prompt charging, but not to charge, or even to charge less.
If the charging cable is not original, the power of the cable is small. Now many mobile phones are fast charging, the protocol is not correct or the power is not enough, it may show charging but the actual charge is not into or very slow.