Looking for a car, marine, motorcycle, or other AGM battery charger? The OPTIMA Chargers Digital 400 12V Performance Maintainer and Battery Charger automatically maximizes battery life and performance with a built-in battery health mode. It also offers a hybrid LED battery-charging gauge with LCD screen and a quick-set battery type selection for easy operation. And because it recovers discharged batteries that others cannot, this is the maintainer that is a must-have in your garage.