Originally Posted by bbv203
I don't think it is so much calibrating the battery, but calibrating the phone to the high and low points of the battery. Older battery types required conditioning, not calibrating.
Bingo! Having three batteries (2 after-market TouchPro 2 and the OEM), I even have a performance difference between the two types. I've since set the OEM battery on a shelf and only use the TP2 batteries, as they are identical. I haven't had a battery issue since calibrating using one of them.
Samsung Galaxy SII Epic 4G Touch
CyanogenMod 9 - Alpha 3
Been rooted since 2010-04-23
HTC Hero (CDMA)
HTC EVO 4G