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! 12.5 / 25 foot extension lead for use to extend the length of the charger's reach from input to battery. Note: Not compatible with 6-volt Battery Tender® Plus or any other Battery Tender® product with white quick-disconnect plugs.