i made about a 3 1/2 hour trip this weekend using the epic as my GPS. i drove up there using navigate, some pandora and the music player. the phone was charged in the whole time. when i reached my location, i unplugged the phone and it was almost dead. on the drive home i used sprint navi without playing movies and my battery was more then 1/2 way done.. again plugged in and charging the whole way. is this normal? i know its not the same thing but my old blackberries would never drain while i did the same thing. what happens if the batter gets to low while its charging and using GPS?