The drill we had was 30V from NuTool with 1.7Ah Nicads Very powerful drill.

Just been testing some cheap 18V drills (also NuTool) and stalling them on 12V gives 50Amps and we run them on 24V! Under stall it takes less than a second for smoke to start coming out of the motors. Another interesting point is the speed controller in the drill has 12-24V 8A printed on the side and testing it through the speed controller on stall gave 40Amps.

Problem with all drill motors is that they have too much power available for there size and can not dissipate the heat for long periods. When was the last time you ran a drill for 5 mins constantly reversing under load without burning it out? The trick is to make sure you dont use all that power usually by keeping your wheels spinning.