I just pulled out my 3GS which I charged overnight, turned on about 6:30am and which I used to send 1 text this morning, nothing else. It?s now about 10:30am and it?s already down to 90%. When I put it in sleep mode, I didn?t press the Home button and when I opened it again, it went directly to the text app. Here?s my question: because I didn?t send it to the home screen after texting, was the texting app running the entire time, thus draining the battery?