I know this probably won't interest you since you want to use the stock back cover, but I got the 3,000 mAh battery from Samsung. Can't say enough good things about it. The new back cover is included. Barely bigger than the OEM and it's made by Samsung so it's genuine.
Also, best part is that it protects the camera now. Where as before the camera was the first thing to hit whatever surface you were placing it on. However, if you don't carry your phone naked, and have a favorite case this option most likely wont work. It fit in my one case, but not my other bomber case. Just figured I'd give you the response just in case.
I get around 4-5 hours of on screen time. Everything turned on except for screen. I never max out the brightness unless I'm outside. Always have a good 25% or more when I plug in for bed. Best purchase I made for my phone. When/if I get the S4, I will make sure to get the new version of the extended battery. Good luck!
Posted via Android Central App