Do you have the iphone 4 software on it? if so double click the bottom round button so the list of things come uop at the bottom and press on them till the delete icon comes up then delete them all because they are all the programs you have running so it drains your batttery x
When I'm using mine for the net (which is all the time lol) or play games it doesn't last long. I have to charge it at least once a day.