We were using 9.6volt drill motors until Sunday afternoon ;(

I think theyll push as hard as the traction on a 2wd 12kg bot will allow and ours happily ran at 12 volts for 12 months and 14.4v for 2 events until one got sheared off the back of a gearbox by a heavyweight trying to pass its weopon in one through one end of the bot and out of the other!

I may be interested in this sort of drill at that price as the only B&D one Ive ever taken apart was a 7.2v job costing over £70 that had a top quality 1.5 large tooth sprocketty type gearbox as opposed to the usual cheap planetry type thingy.

If you can follow that tech talk youre better qualified than me