Just wanna throw this out there as well. If size isnt an issue and you wanna get a 3600 mAh batt, I *highly* suggest you check out the Tritan Elektra series cases. They're expensive as **** on their website, but I got on one ebay for around $35 bucks (with free shipping <3 amazon prime) and the case is a BEAST! I accidently left my phone on top of my car while filling up for gas, took off down the street and heard a sound as I went over a bump (probably going around 35-40 mph) and watched as my phone fell off the back of my car. Ran back to it, and the only visible damage was a few scuff marks on one of the corners of the skin. Totally worth it.
Phone: Dx2 CM7 Beta