I just wanted to let ya'll know I bought the Trexcell 3800mah batt about 2 weeks ago. It comes with the back cover, but they ALSO just custom-made a black TPU case for it. I ordered it on Tuesday and should be here next week. But in the meantime, I've been using my standard TPU case and I just cut out a section in the back.
For people like me, who use their phones only sporadically throughout the day, texts here and there, don't use GPS, 4G, or Bluetooth rarely, and have brightness set to Automatic, this batt is a godsend. It's awesome only having to charge every 3-4 days. I have wifi on when I'm home, and turn it off when I go to work. I'm still conditioning the battery, so it will get better and better with time. In case you're wondering, the extended cover only adds about 3.5mm to the outside of the phone. Even with the battery, it's still thinner than my Samsung Intercept I was using before.
This is just info from my experience....take it or leave it. If you just have snide remarks, keep'em to yourself. I agree, the case looks unattractive now with my cutting, but the custom TPU case from Trexcell will be nice once I get it. I'm sure there are users out there like me though, who love Android and the mfr's for allowing batt changes and aren't power users. If you have any questions, feel free to PM me.