I have had very good luck with using never-seez on battery connections. There are several benefits, and no down side. It is anti-corrosive, quite conductive, and the bolts come off easily the next time you need to take them apart. There can be corrosion in several places, at the battery, the ends of the cables (both ends, both cables) the ground strap. One other thing you might want to do is keep the top of the battery clean, as the battery charges it gasses, and leaves something on top of the battery that tends to help make that wonderful white cauliflower looking stuff. (I used to spend a lot of time tending to batteries on ships, no I mean a lot)
