1, the remaining battery power is basically exhausted, so it needs to be charged for a while to slowly recover.
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2, if the charge is still displayed for a long time, the battery may be damaged, so it can not be charged.
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3, it may also be the phone charging line has a problem, you can try to use a USB cable to plug the computer charging try.
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4, the charger loss, so it can not be charged.
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After the above investigation, if the battery or charger loss, you can only replace the hardware, but if it is a mobile phone problem, you can send it to repair.
Check that the charging cable and charging head and the connector to the phone are properly plugged in. If it's not green, it's probably a broken tail pin, and a new tail pin will do.