+1 the fleabay batteries will always give issues.

I've bought batteries off ebay twice.

First time was for my Motorola v300 way back years ago... teh new battery never charged past 70% and it dies in about 4 hours STANDBY

Second was for my W810i (second battery as a backup). Once again never charged full and it died fast.... bottom line is i think SE and phone companies put a lot of tech into their batteries these days and the china knock off's just cant keep up. The batteries look and fit like they should, but they just dont have the perfect specs.

My 810i battery still lasts me about 5+ days on a single charge with moderate use. One of the best features of the phone!