[BrianG]

It's hard to tell without measuring. A good approximation can be found by calculating your average current draw by:
( pack_Ah X 60 ) / runtime_in_minutes
Your peak current is approximately 6 times that number (give or take).

So, if you have a 2Ah pack that lasts 25 minutes, your average current draw is 4.8A. Your peak burst current is somewhere around 28.8A.

That said, whatever current you get on X voltage, you will get more current on more voltage assuming all other things are the same (gearing/drivestyle/etc).