The Milenco Optimates are the world’s most efficient and advanced Desulfating Charger/Maintainers available. This is the ideal product to protect, charge and maintain your recreational vehicle battery for those periods when the vehicle is not in use and you do not have mains power to plug into. The worlds most advanced fully automatic solar battery care. Can be used on cars, caravans, motorhomes, vans, motorcycles and boats.