[Lee]

I would think a 4.5 woulf probably draw somewhere in the region of 130A+ from a standing start, i know i had brushed motors that would show 140+ on a dyno.This is only for milliseconds though.

I think the cells would give the motor what it wanted within reason, just remember that it is only a spike and not a constant current. The speedo will also limit the motor to about 120A depending on the profile used.