[cbale2000]

We use battery powered Dewalt drills, but since we only have like 3 batteries and 1 charger (that works, anyways) I make sure we always bring the old corded drill we have with us to events. It's saved us on a few occasions were the other drills were either dead or not strong enough for something.

We also use a corded Dremel tool, but that's mostly just because the battery powered versions don't seem to work as good.

In theory, battery powered is the way to go, but you have to make an investment in a decent number of spare batteries and chargers to make it practical.