I've had the Inspire for over a week now and the battery life up until today has been less than impressive. Yesterday I let it die completely and then charged the phone while off. When I went to bed I left it plugged in but turned it on. I took it off the charger at 5:30am and as of 11:00pm and I still have 10% left with moderate to heavy use. The day before I took it off at 8am and it was about to die by 7pm. Does charging the battery with the phone off make that much of a difference or did something else happen? I love the phone but up until today the battery was killing me.