1. There is a problem with the charging plug
If the phone is charging too slowly, you can consider borrowing the plug that also supports mobile phone charging to try, if the charging speed is restored, then it is necessary to buy a replacement mobile phone charging plug. In addition, the plug used by different mobile phones is not the same, because the charging plug power of different devices is different, if the power of the charging plug is too small, it will slow down the charging, so be sure to match the correct charging plug.
2. Data cable problem
The current supported by different USB cables is not the same, if the use of an unsuitable USB cable to charge the phone, then the phone charging is also very slow. The solution is also to borrow the same support for mobile phone charging data cable to try charging, if the charging is normal, then please replace the mobile phone data cable.
3, battery problems:
In normal use, the sudden damage of the battery is relatively rare, and at this time, the battery can be calculated according to the use time of the mobile phone. Check whether the battery has not swollen, if there is a bulge can only replace the battery, but now many smart phone batteries are closed, can not be removed, the user can not observe, this situation can only recommend to the mobile phone after-sales testing, if the battery is really damaged, then please replace the battery.
It may be a battery problem, it is recommended to replace a new battery, or go to Apple's official after-sales to see.