As everyone else has said, it depends on how you manage the apps and things that use your battery. I easily get 12-14 hours on light-moderate use. I would suggest running the battery down until it dies and then letting it recharge off all night a couple of times, I had a vast increase after I did that. Also, my infuse battery seems to be getting better with age. The screen is an energy sucker, so make sure you keep it off as much as possible if you want to maximize battery life. I made the switch from iPhone 3g, and the only disappointment I've had is that it takes 3+ hours to charge.