X2 CRT with 6s2p A123?

hi,

i want converse my x2.
because they are fast charged i want use a123 cells instead of lipo.
i thought about 2 packs with 6s1p.

maybe i can place the engine at the fuell tanks place, then i have space.

is anybody here who use this in a x2 or a truggy that is similar in design?
how he will drive with this heavy batteries?