The Snap-on 4 A 6/12V DC Battery Maintainer, No. EEBM500A, is suitable for use on stored or seasonal cars, trucks, boats, SUVs, motorcycles and more, to help ensure vehicles start when needed, even after extended inactivity. It is compatible with conventional lead-acid, maintenance-free, AGM, gel cell and deep cycle batteries, and feature a quick-connect output cord with a clamp set, ring terminal set and 12V adapter output accessories. An LED charging status display indicates when the charge is complete.