Duraboost Battery Charger / Maintainer 750 Constantly monitor your battery voltage with these Duraboost Battery Maintainer. If your voltage drops below 12.8V, the charger will charge the battery at a constant 750 mA until the battery is fully charged and then turns itself off. Features: Checks for proper battery connection polarity and for internal battery damage Automatically switches from charge mode to maintenance mode Red LED light shows when charging and changes to green when fully charged 0.75 amp charge rate Overcharge and short circuit protection Includes SAE quick disconnect battery lead and SAE Alligator clip lead Safe for use on all 12v Lead Acid type batteries including, Conventional Flooded (wet) Factory Activated Maintenance Free (Mf/Fa), Absorbed Glass Mat Maintenance Free (Agm), and Gel (Gel Electrolyte) type batteries