OEM HTC battery. After reading numerous shady reviews on other batteries, I decided to spend a few more bucks and get the OEM as a spare and it works identically to the one that came with the phone. Avg phone life is identical as well as rate it charges. T-mobile MyTouch 4G MyTouch 4G OEM HTC Standard Battery BB42100 35H00142-02M
Doesn't last as long as the stock battery. Used it as a primary for over 3 weeks and on an average, it lasted about 12 hours on heavy use (music, browsing and 3 emails, fb, twitter syncs, all while traveling). I would say it lasts about 80 - 90% compared to stock battery. Overall, for the price, its definitely worth it.
Arrived early (thank you!) and was just as described. I lost my original when the battery died and popped in one of my 1500 mAh spares. The spares are good for just that, "spares", but not as good as the original. It's great to have an original back.'
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