I'm sorry, but coming from a 3GS (and a first gen before that), I'm baffled when any iPhone gets more than 5 hours usage time. My iPhone 4 just doubled that. Pictures below. Full disclosure: I lastly unplugged it from the wall last night just before midnight at which time I promptly put it into Airplane Mode w/ wifi (as I always do overnight, don't want idiots texting/calling me), put it on my nightstand, opened up Pandora, and set the 25 min "Sleep iPod" timer (which I just found out works with backgrounded non-iPod apps, YAY) then when I woke up 8 hours later I turned off airplane mode and have used all apps listed in my recently used panel shown below. Haven't plugged it into computer/wall since.... This battery is a monster.