Fully automatic 7-stage battery charger, designed for trickle charging and maintaining a variety of EFB and AGM (stop/start), GEL, lead acid and calcium batteries with auto chemistry selection.Automatically selects and charges 6, 12, or 24V batteries depending on battery connected.Zero volt battery charging, enabling recovery and charging of a completely discharged battery (providing any load removed from the rechargeable battery).Old battery sulfation repair function.Reverse polarity, short circuit, over temperature and overcharging protection.Intuitive LED screen displays illuminated charging stages, volts and amps output and battery capacity.Compact design with unique retractable hanging hook, and cable management system which allows the clips to be stored neatly away when not in use.5 Year guarantee*.