I did the exact same thing with 2 of them. They were so bad Sprint offered extended batteries, but they were only 300mAh more so not much of a help at all. If you can get an extended (max you can get) battery it would be a great phone to have and enjoy. I traded both of mine for a Galaxy S2 and iPhone 4s.
I saw that as well. If it's not the CDMA version, then this seller is going to refund me. I can always put a dispute on the charge with my credit card.