So my Surround's battery started acting up and decided it didn't want to hold a charge longer than 3 hrs. So I called HTC and they told me to call ATT, since they handle battery replacements under warranty. After a 10 minute call to ATT, they sent me a new battery. 5 days later, got it in the mail and started using it immediatley. I've noticed a big, no, make that a ginormous improvement. I took the phone off the charger yesterday at 9am. 28 hrs later, from eyeballing the battery icon, I still have about 25% life left. Wow.