As long as it can be used normally, it will be charged normally, just overcharged and discharged.
Online, just buy a mobile phone battery and change it yourself.
You won't change yourself? You can also take it to the repair shop to exchange it. ?
But listen to a friend say a method that you can try.
20% power alarm, charge immediately. Can quickly restore health.
This method has been done three times in a row, and he said that it is estimated that it can return to more than 90%.