It all depends on what you do. I'm on a wifi connection most of the time, and on a pc, so I don't use my phone for music, videos, game play, or even browsing all that much...and get 3-4 days! My wife just picked up hers today, so it'll be interesting to see how hers compares. Even power users report getting a very full day, tho'. I'd say you should expect 1-3 days, depending.