ok, the one i went for was listed at $59.99, with a $10 instant coupon. i went to NorthernTool.com, which was the first site listed. i know their prices to be competitive, but their products usually come from china and overseas. can either be plugged into the cigarette lighter or use the battery clamps. this is the one:
http://www.northerntool.com/webapp/w...5091_200305091
good luck, whatever you decide to do. sounds like you had a bum charger last time.