Fully automatic 8-stage battery support unit andbattery cp charger, designed for charging a variety of EFB (stop/start), GEL, AGM, lead acid and calcium batteries with auto voltage selection. Additional function to charge lithium batteries via selection button. Automatically selects and charges 6, 12, or 24V. 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. 13.5V DC power supply for battery support function providing support for the battery during prolonged electronic diagnostic checks. Reverse polarity, short circuit, over temperature and overcharging protection. Built-in cooling fan that only operates when required. Intuitive LED screen displays charging voltage, current, battery capacity percentage, and illuminated charging stages. Compact design with mounting brackets for permanent fitting. 5 Year guarantee*.