If you dont mind me asking, what do you consider heavy usage?
My battery indicator is around 30% at the end of my 15 hour day of useage while entirely away from any wifi connection. With a wifi connection for the full time my battery is at 40% after the 2nd day of useage. Pretty impressive if you ask me and 8 am a heavy user of my phone not only as a phone but as aocket computer. I have been unable to kill this phones battery in any single 15 hour days useage. Best phone I ever had and will be better nice ICS is pushed out to it.