1. The charging plug is not properly inserted. The voltage when charging is mainly concentrated on the plug, if the plug is not plugged in, it is easy to lead to insufficient voltage, slow charging and so on.
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2. The correct plug is not selected. The plugs used by different mobile phones are different, each device has its fixed plug, be sure to choose correctly.
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If you use a low-power charger to charge a large-capacity device, it takes a lot of time because the power is not enough.
For the safety of mobile phones, the faster the charge, the lower the charging power