This may be due to the following reasons:
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1. Charging cable or charger problems: If there is a problem with your charging cable or charger, such as loose, damaged, or unable to provide enough power, it may cause the phone to not get power properly when charging.
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2. Battery aging: As the phone is used for more time, the battery will gradually age and its capacity will decrease, so it may not be able to charge as quickly as a new battery.
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3. Software and background apps: Some apps may run in the background and drain battery power, especially when charging and using the phone at the same time. At the same time, there may be some software issues that cause the battery charge calculation to be inaccurate.
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solution
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1. Check whether the charging cable and charger work properly. Try using other charging cables and chargers to charge and see if there is improvement.
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2. If the battery is aging, you can consider replacing the battery of the phone. Please consult the mobile phone after-sales service center or professional technical personnel.
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3. Close background applications to reduce battery consumption. This can be done by cleaning up background apps or using battery management apps.
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4. If the problem persists and cannot be solved, it is recommended to consult the mobile phone manufacturer or professional technicians for more detailed help.