The battery will never tell me its finished charging if I am using the phone. Once i just unlocked the phone and waited on the home screen after looking at the menus, after i lock it, it then becomes fully charged. Or if i get board of waiting and start playing a game as 3 hrs charge nearly done however yet i wait and played for half n hour but battery didnt tell me it was finished when i closed the app it said it was still charging as soon as i lock the screen it vibrates and says full charged. is this normal? and if not whats the problem.