I got a gold battery from ebay for pretty cheap (i think $20 with shipping). It seems to work better than the original. It is 1430mah iirc. I've run a few tests on both batteries and it does work better by about 20 percent. Perhaps he original battery was defective *shrug* I'm really not sure how they stuff more juice in the same amount of space. Using the new battery with wifi/3g on and trillian and gmail syncing in the background, the phone will last 15 hours with regular use. Never tested with wifi/3g off and a lower screen brightness, perhaps it would last much longer. Still I've got the original battery with me as a backup.