I dunno, I guess i'm not a battery expert. I just know these Super Android Phones aren't really that great in terms of battery. When you make a switch to one of these phones its kind of a shock at first to new users. Then you realize all these Super Android phones... Galaxy S, Evo, DroidX, INcredible, etc... all suck at battery life.
Just exchange your phone, then if your new phone behaves the same way, you won't be doubting your purchase, you will feel confident that all of these phones suck at battery life.
Try one other thing..I have to admit I don't know if this really works, But I use it, download Advanced Task Killer (ATK) and see if that helps you. THere are arguments for and against this program. Some say its total bull, I gotta admit, I kinda think it helps.