I bought the extended battery and did two charge cycles. On my normal everyday use (3G HotSpot, Text, Voice Calls, 5 Email accounts, FIFA Soccor Game, 3D HomeRun, camera, Picture review, and 30% brightness) My battery last 30 Hours on 1 full charge. On the Original Battery 10 Hours MAX. The Key is to let the battery run dead and the fully charge it. Batteries have an internal memory that if you keep charging it at 50% the battery will form a memory to that and weaken your battery. I hope this is helpfully.
Dang, now I'm jealous...mine is BHX6, but only 1880 mah. I guess the newer ones have more juice. Oh well, I still go to bed around mid night with 40 to 60% left. That's all I really care about.
I actually use the oem extended by VZW with the replacement batt cover. Very little difference in size but I notice several hours more per battery charge. FYI... The newer extended batteries are now packing 1930 mAh as opposed to 1840 mAh.
...The Key is to let the battery run dead and the fully charge it. Batteries have an internal memory that if you keep charging it at 50% the battery will form a memory to that and weaken your battery...
I have the BH6X and it took a couple cycles to get the most of it. I notice around 2-3 more hours of usage.
BTW you can actually use the original battery cover.