Rustler VXL on A123 cells?

[Superbasher]

Hi guys and and gals,
I'm going to be getting a Rustler VXL soon, and was wondering if the ESC will work with A123 cells? as I was looking at getting a 9.9v pack, but will the auto-cutoff still work with these cells? I've not done much reading up on A123 cells, so all I know about them at the moment is that they are a safer chemistry, and the same (?) voltage as LiPo.
Any help/info appreciated.
Cheers
Matt