The Ring Multi Stage SmartCharge is a fully automatic battery charger designed to increase battery life and reduce costs. This 12A smart battery charger is made to be used with vehicles up to 5L and is essential for the maintenance of Start/Stop vehicles.Fully AutomaticWinter Charge Mode (for cold weather charging)Maintenance Charge FunctionSome traditional battery chargers can either over or under charge a battery and are not always capable of charging some batteries, particularly those in poor condition, especially when battery technology is changing all the time. The auto charge function applies the fastest charge, based on battery size. Also has separate functions for standard or Start/Stop vehicles and has a function to repair batteries to increase performance and life.The charger has a memory function that allows the vehicle and audio settings to be retained if you remove the battery. The Ring Multi Stage charger has 4 levels of analysis tools that test the power, alternator heal