I'm not exactly sure why this is happening. I plug my phone up to charge it. It shows that its plugged up and charging, but the bar never moves. I come back a few hours latter and the bar is still in the same place. I restart the phone to find out that now the bar is at max when it turns back on. Its been doing this since I got it a while back, but I never paid much attention to it. Any idea why its doing this? Is it a setting or just something weird the phone shouldn't be doing? Thoughts?
Do a soft reset, this will restore to the original settings, but I have a feelings it's not. It might be your charger is having a problem? Did you try using another charger? You cannot change the battery since it is non-removable.
For safer options, if you have your warranty, bring it back to your courier or where you bought it for repair.