It may be that too many apps are opened, you can shut down and restart it, and then charge it again.
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If there are no special circumstances, you can also shut down first, and charge it in the shutdown state.
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Shut down also can not charge into the electricity, it should be the battery is broken, you can consider changing the battery. You can also try it with a more powerful charger.
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Display charging, do not use the phone, can charge slowly, use the phone while charging power off, most of which is the data cable\/tail plug damage,