Alright well ever since I got my iPhone last Friday, I have been wondering if my battery performance was sub-par or not. I wasn't able to accurately tell how long my battery was lasting because of crashes, etc., resetting the timer. Until Today.... Seeing that I only got 3 hours and 27 minutes of usage until the 20% alert, I am thinking there is something wrong with the battery. This usage consists of about 1 hour of texting/web browsing on wifi, 1 and a half hours on 3G talk, and about 1 hour on 3G browsing. I have push off, fetch at manual, brightness at about 20%, 3G on the whole time, and about 3/4 of the time with wifi enabled, 1/4 disabled for the 1 hour of 3G browsing. I am concerned because I was able to burn through 20% of the battery (from 40% to 20% warning) in half an hour of 3G browsing. This is obviously not right. Something else I happened to notice was that as soon as I started using the phone whether it be calling or browsing, the back of the phone (center of phone, halfway between Apple logo and the iPhone label) would instantly start to warm up. It didn't get hot to the touch, but i'm guessing about 85 - 90 degrees Fahrenheit temperature. I am pretty sure this is where the battery is located on the phone, and I know a hot battery probably means that it's defective. Any tips would be helpful, otherwise I'm going to contact Apple and see what they say to do.