The GENIUS is a 6-volt and 12-volt battery charger, battery maintainer, and battery desulfator rated for lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, and maintenance-free, plus lithium-ion batteries. Enjoy precision charging- An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climatesCharge dead batteries- charges dead batteries as low as 1-volt. Or use the all-new force mode that allows you to take control and manually begin charging dead batteries down to zero volts.Simple to set up and use- plug in, connect to the battery, select a charge mode, and start charging your batteryRestore your battery- Detects sulfation and acid stratification and restores lost performance for stronger engine starts an engine battery lifeCompatible with all types of vehicles