Multifunction Charger-The automatic smart battery charger is designed to charge 12V and 24V lead-acid batteries from 6AH-150AH(12V),6AH-100AH(24V),which is suitable for charger AGM,GEL,SLA and WET...battery. Easy Installation-Connect the Red lead form the charger to the positive(+)battery terminal.Connect the Black lead form the charger to the negative(-)battery terminal.Connect the battery charger to AC mains powered socket. The charger will automatically start when AC power is connected and switched on. 3 Stage Charging-The 3 stage microprocessor controlled charging process provides the best possible application and enables efficient battery charging. Easily switching from fast charge, to top-off, then to trickle charge. Vehicle Mode Selection-The intelligent pulse repair charger provides various charging modes:CAR/TRUCK mode for big batteries(fast charge)-12V:charge current max.8A;24V:charge current max.4A.MOTORCYCLE mode for small batteries(slow charge)-charge current max.1.5A. Repair Production Mode-Capable of recharging severely discharged or heavily sulfated battery.Reverse polarity production,short circuit production,sparks free contact.An advanced battery recovery mode for repairing and storing,old,idle,damaged,stratifiled or sulfated. Note: It can not activate a dead battery or repair a battery which is damaged seriously; it also can not repair a battery back to 100% new.