For comparison, mine has been unplugged for 5 hours and I am on 82%. Ive spent about 30 minutes onthe phone and the wifi has been on for 4 hours at least. I have push e-mail on all the time and full brightness with active wallpapers and I've done a bit of browsing and general fiddling. I had a previous phone (3 network) with horrific battery life and it was down to the fact that it was always trying to boost the 3g signal as it was poor at my home. Could that be your issue?