Voltage problem, voltage instability will lead to abnormal charging, use wireless charger or re-plug the phone can be.
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three
Check whether the contact is poor, the charger is not plugged well may lead to poor charging, reinsert can be.
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four
Check whether it is the charger problem, put on another charger to try, if it can be charged, it means that the quality of the car charger is the problem, replace it.