hmm, I'm wondering if maybe I have a lemon....
I have all the push notifications and syncing off, I like to manually do that stuff anyways. Brightness is low, maybe 30%. Almost always on WiFi unless I'm at school or out and about. I usually just text, maybe a couple hundred a day, but that's a lot. so average 150. Almost no email, maybe 10 minutes of phone calls, and about an hour and a half on the internet (I get bored in my classes haha) but that is on school WiFi and sometimes 3G. So nothing extreme I don't think.
Y'all suggest: turning the phone off at night while it charges, run it low for a while (into red), juice defender (I had it, but didn't notice anything change...maybe I was doing it wrong...). What else?