We actually sell the Benton Chargers, send me a PM with your email addie and I'll send you our price list. The best sellers are the BX-1 (12v3.4A) and BX2 (12v 7A) models. I use these on my boats as well, batteries average 7-8 years life. For anti-sulphation purposes, the BX-2 is the better bet...