I signed up because of this thread. Its great to find others that have tried this. I have posted some of this on other sites..
I bought the 3600mAh from ebay for about 13 bucks. Popped it in and it was at 75%. I used Battery dr. app to see what usage time are compared to stock. Even at 75% it should have been more then what the stock batt had.... but it didnt.
Anyway, I thought it was a cheap chinese battery and just left it in the phone and charged it over night. I thought it was a wash and didnt thinking about it till later that day.. After it was charged the wife used it a little and hours passed. When I picked up the phone it was still showing 100% so I re-charged it just in case and ran it through a test.
Turned wifi on
sound at max
ran a long netflix move 2H:30min+
then did it again
and again.. haha
Anyway I didnt finish the 3rd time around, but it looks like I can get with all that **** on about 7 1/2 hours of netflex. Hell without wifi and bluetooth that might be over 8-9 hours..
I have not tested the stock one, but I dont think it will last that long. Which leaves me to think for some reason the Battery dr. app or something is not really forecasting the right amount of talk/video time. Also I ran Nav for over an hour the phone was warm and Battery Dr. showed the same temp all the time. maybe there is another app to try.. or maybe there is something in the battery that gives the phone info..