Off the cuff figures:
A 5C current is reasonably sustainable from power optimised cells for a short period depending on cooling etc (i.e go from 100% SOC to minimum in 0.2 hours) so a 20 KWh pack could deliver 200KW of power at a cost of about $4000 and a pack weight of 100-150kg.
A 200KW IPM motor and planetary reduction gear could weigh down to about 40-50kg.
So you could have a 250 HP auxiliary motor with ~10 minutes endurance for a weight penalty of about 150-200kg.