Galaxy s3 charging problems

[kittykaat21]

My galaxy s3 hasn't been charging. I've left it charging for a good hour and a half and it will only say its at 16%. i got a new charger and that hasn't seemed to work either. i figured if i turn it off it will charge but it when from 11% to 8% i even put it on airplane mode so text messages and apps wouldn't disturb it considering it charges on and off by itself, but that doesn't work either..

 

[Rukbat]

Turn it off. Plug in the charger. Wait 24 hours.

It's a charger, not an external power supply for the phone. It can't supply enough current to run the phone and to charge the battery, so what happens when you try to charge it with the phone running is that you drain the battery slower, but you drain the battery.