I will say I bought one of these
http://cgi.ebay.com/2800mAh-BATTERY-...#ht_2270wt_912 and I have had great luck with it for the last 2 weeks. It doesn't get any hotter than normal. I use the phone pretty heavy and I have been able to go almost full 3 days without charing (although I still normally charge overnight everyday.) I mainly use data, video, text, not a lot of talk time. Anyways have fun!!!