I got my Iphone 5 on release and i realized that recently it has been losing power rather quickly so i took it the apple store. They ran a test and my battery came up "worn, 75%" because it's not defective exchanging it under warranty was not an option. I would have to pay $80 for a new one. Is this normal? Would everyone who bought the iphone on the same day as me have the same result? I work on a computer 8 hrs a day my iphone is always plugged into the usb all day long. Would this be the problem? Not sure why i always thought after 100% charge the iphone wouldnt be affected even if its plugged in.