The VIKING™ 1.5 Amp, 6/12V On-Board Battery Maintainer keeps batteries topped off during cold weather or when vehicles are in storage. This battery maintainer is designed for safe mounting inside the engine bay or on walls. The maintainer is ideal for use with automobiles, SUVs, trucks, riding lawn mowers, UTVs, motorcycles, jet skis, RVs, boats, and tractors.