Avoid the potentially damaging effects caused by most trickle chargers! Battery Tender® BTP Microprocessor Technology and quick-connect convenience automatically maintains the batteries in all your vehicles so they are ready to go when you are! You just set it, and leave it! Battery Tender® assures the highest quality, fast-charging convenience and performance. The choice of collectors, dealers, and fleet owners, Battery Tender® state-of-the art chargers can actually save hundreds of dollars in replacement batteries! Designed for use on 12-volt flooded, AGM and Gel batteries. Display voltage range is 3 to 16.