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DieHard Battery Charger/Maintainer Brings Fully Automated Charging from the Convenience of Your Vehicle Fully automated and lightweight the DieHard Portable Battery Charger/Maintainer is a great handy tool for use during emergencies. This portable charger is perfect for use on 6 and 12 volt lead-acetate batteries. Keep your batteries fully charged and ready to go when you need them most. Featuring the Float Mode Monitoring this DieHard Battery Charger/Maintainer prevents batteries from overcharging while its Reverse Hook-Up Protection makes it safe for continuous performance. This charger includes 50 amp battery clamps which help you maintain batteries of cars RVs boats motorcycles lawn tractors ATVs snowmobiles or antique and classic cars. Bring home this battery charger and start up all your winter equipments with ease.