Drill batteries are great, just use a 14v. I think 18v would border on risky for the motor, though probably not for very intermittent use.

Be extra careful, a drill battery is more than enough to trigger an airbag or seatbelt tensioner.

__________________
-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition