I'm sending the question to Mike Mayberry of Hitec. He'll answer the technical stuff for Hitec/Multiplex. I like to run the 5 cell 3300mah sub c nickel metals anyway. They'll take lot's of abuse--and I don't have to worry about a possible on-board fire from an impact. I need the weight on that side of the car anyway to offset the weight of the motor on the other---and I can hang it really low in outrigger style so it helps with handling.
FWIW
TIm