I am getting about the same performance as STL Tech Talk. Since the phone is new and I am still getting used to it and trying different things I have been using it a lot. The first day 7hr 15mins 53% left 51% Screen. The second day 11hr 45min 63% left 37% Screen. Now I recharge the battery each night so I have not tried to see how far it will go until I get 2% left, I may this weekend.
Now I have moved to the Nova launcher and have a couple of widgets. I have shutdown S Voice and a number of other vendor added things that I did not need or want. Both of my locations (work and home) have crappy cell signals (0-2 bars normally) so my radio is probably getting a bit of a work out. In other words not an optimal cell situation but the phone seems to handle it well.
AllPhoneNews, you probably should try a new battery. Where did you get your phone? If it is local just go down and complain. They will probably give you a new battery gratis, hell maybe a replacement phone. If you ordered it from AT&T it might not hurt to go to the local AT&T store and complain they might give you a new battery anyway. Even if they don't you can buy a new one and give it a go. It might actually be a faulty device so you might have to exchange it. But you want it to work and work properly so I don't blame you and this is a really nice phone so you want to enjoy it.
Coming from a Torch 9800 3G phone this phone is amazing. I cannot seem to keep my hands off of it.
Mike