Part # A-5165-HD | Model Year 09-31 6 & 12 Volt Charger, Maintainer and Tester is the latest upgraded and redesigned version of our 25W Charger, Maintainer and Tester. This model features our signature State-of-the-art Pulse Desulfation Technology and can safely maintain up to two vehicle batteries connected in the https://www.vintagefordpartss.com/product/25-watt-battery-maintainer/