Thanks nick, that makes perfect sense, I was wondering however, if an increase in load (it's a drill driver) would result in an increase in amps being drawn, possibly up to more than the windings, etc... can take.

For a given trigger position (speed), surely driving a screw into cotton will draw less current than the same driven in a harder material - hence my thinking along the lines of the battery will be able to provide (flow) more current... Am I making sense.

I now realise why I shouldn't have partied so much when I was studying electronics