I too was looking at getting the extended battery, but havent yet because of this. I really need the otterbox protection in my field of work. Just throwing this out there, but would it be feasible to use a dremmel tool and cut the back out of where the stock cover is, and also on the plastic case of the otterbox. Esentially everything would still be protected, jus where the battery sits, would only have the rubber case part over it. If any of that makes sense to ya...lol I dont have the extended battery to compare, but in theory, I am thinking that it wouldnt protrude out any further than the case already is, and would still be protected from bumps, dings and dirt. What are your thoughts? Does anyone have the extended battery to where thicknesses could be guaged?