The Battery Tender Plus is a 1.25 Amp battery charger designed to fully charge and maintain a battery at a proper storage voltage without the damaging effects caused by trickle charges. Our "BTP" micro-chip technology applies the correct peak charge, then automatically maintains the battery at the perfect float voltage which virtually eliminates battery destroying sulfation! What does all this technology mean to you? A battery that is ready to go when you are! "BTP" microchip technology will extend the life of your battery. The Battery Tender Plus will correctly charge and maintain any type of lead-acid battery - AGM (absorbed glass mat), sealed calcium, or gel batteries. 12 Volt, 1.23 Amp.