The Battery Tender® 12V 800mA battery charger and maintainer has all the features of our best selling Battery Tender® Junior in a mountable rugged water-resistant package. This 800 milliamp battery charger is shock and vibration resistant - perfect for all types of vehicles that may be exposed to the elements. This charger has additional functionality to switch between traditional lead-acid flooded or sealed maintenance-free batteries and lithium batteries.