Boats-r-US has a Seafit 12v drill on sale. Is there a 12v drill which will
run and/or charge off your boat batteries?

Any drill will charge off a low cost inverter. Buy a good one, such as a
Makita. I carry a Makita C2 and a low cost B&D combi drive.
Is there no end to your idiocy and cheapness?
With a boat like yours don't skimp on tools!

RB