tamosaur, when I was buying my myTouch 4G the rep told me that when he first charged his phone and used it, his phone died in 3-4hrs. He thought something was definitely wrong but after charging it all the way again, the phone lasted him 24 hrs with ~30%'ish left. That being said he said he's not a heavy user (no games, just phone calls,texts, browing web 3-4times). So i don't know if you calibrated it yet but why don't you use your phone until it shuts off on its own and recharge all the way. If anything you have 30 days return period so you're safe.