Turning On Your Data While Charging.. Without charging, we all know that when data is on the battery goes quicker...while charging the battery leaving the data on will slow the charging rate because some of the power going into the phone is already been used immediately.. If you forget to turn off your data while charging, it will definitely reduce charging time.
Charging Your Smartphone with your Pc. If you're using your PC to charge your phone, then expect that your phone is going to charge very slowly. That usb output is mainly meant for pc-mobile transfer.
Background Apps Are Killing Your Battery. While charging, some app are still stealing power...
Your USB port is damaged. It's possible that you may have broken or bent a pin inside your phone's USB port.
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