Personally I would recommend using No-OX paste as it is conductive where the dielectric grease is non-conductive. It is the same product electricians use your electrical service boxes prevent bad connections from corrosion and oxidation.Disconnect battery ground cable first & apply Silicone Dielectric Grease to both cables & posts. This will keep weather elements from starting corrosion. Wear Safety Glasses & remove battery caps covering cells, make sure acid levels are 1" below top of each cell & replace caps. Battery tender can stay connected through Winter.