The Wagan Tech 4 Amp Intelligent Battery Charger is light weight and compact. Its digital display is powered by selectable mode intelligent microprocessor with 9 stage fully automatic charging and battery reconditioning. The intelligent battery charge can charge both 6 volt at 1 amp and 12-volt at both 1 amp and 4 amp AGM, GEL, flooded and lithium vehicle starter batteries. The battery charger has short circuit, reverse polarity, overcharger and overheat protection built-in. .This Intelligent Battery Charger is ideal for maintaining and restoring your battery especially when it will not be used for an extended time. Such applications include ATVs, snowmobiles, motorcycles, watercraft, trailers, RVs, ride-on lawnmowers, tractors, classic cars, auxiliary batteries, back-up power supply, solar battery, and more!