Well, my Mugen Power "1900" mAh (and I use that number skeptically) slim extended battery arrived and I've had a chance to run a comparative test on it. Charged it fully and used the phone till battery was low. Fully recharged it and then ran Netflix on 4g with full screen brightness. I did continuous streaming until the phone died. It lasted about 1 hr and 35 min.
I then ran the exact same test on the OEM 1640 mAh battery. I ran Netflix on 4g with max screen brightness. It lasted over 2 hours before the phone died.
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