Battery Tender 6V
Product Review (submitted on November 13, 2010):
I have used a 6V BatteryTender for several years to maintain the charge on my 1951 Ford Custom. I was so happy with its performance that I bought 2 more to maintain the batteries in my 1940 Chevrolet Special Deluxe, and my 1952 Studebaker Champion. I never experienced any overcharging problems, and when taken out of storage, the battery was fully charged.