There are the following reasons
When charging, especially the use of more than 20W charger charging heat is a normal phenomenon, almost any mobile phone in the use of fast charge when the mobile phone will appear fever.
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2, one way is not to play the mobile phone when charging, such as watching videos, playing games, so that the mobile phone fever will be more serious, while the battery is also relatively large damage.
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3, if you do not worry about the phone battery full, you can also consider using a lower charging power charger, relatively speaking, the phone will be less hot, but the charging time will be a little longer.