[What's_nitro?]

That is what all LiIon cordless drills have. Protection circuitry built into the pack. I can't imagine how many accidents there would be if the general public had to balance their batteries manually. I think that's also why we don't see LiPo batteries in drills. The risks outweigh the performance gains. It would cost a lot more to have the circuitry, but it would be pretty nice just to be able to put it on the charger and come back in an hour.