So yesterday I noticed that the battery on my 3GS went from 100% to 30% in less than half a day. The catch, I didn't really use it for anything (1 call less than 10 min, a couple of email checks and that was about it). Before yesterday I always got about a days heavy use from the phone. Today it seems worse as I actually saw the battery drain 30% in 10 min. I am planning to take it in this week to have the Apple take a look at it. Has anyone else experienced such extremely horrible battery life? Keep in mind I've owned every iteration of the iPhone from the beginning (2G, 3G, 3GS) and use my device constantly, and i've never had battery trouble like this.