Turns out the droid4 is very tolerant of 'diverse' batteries. Even with stock android. The simplest connector i found was to take a sharp knife to a wire, poke a hole in the middle, and push the torx bolts through it. Positive end goes to the outside of the case. http://0x0.st/-fLO.jpg Result: 1040 mAh to 3800 mAh http://0x0.st/-fL4.mkv Yes a back cover was sacrificed!