All of the accessories will work, including the extended battery. Actually, the stock battery door is "ever so slightly" more outward than the original X door. With a "very" minor tweak to the door legs using some needle-nose pliers, I'm able to use my extended battery from my original X without having to use the extended battery door, and there isn't the pressure on the phone that the original X had when doing that (that caused the screen distortion problems). The door stays locked firm, but doesn't require any real force to open or close it that would cause worry about the battery being squeezed in too much. So now I have a stock looking X2 with the extended battery.
HTC DNA - Unlocked / Rooted / S-Off / Eng. HBoot / LK_DNA kernel
MOTOACTV 16GB - Rooted / Zeam Launcher
Retired - DX, DX2, D3, Rezound
If you like what I've done, hit thanks or buy me a beer.