The GENIUS1 is one of NOCO's most powerful, highest-performing, energy-efficient, and compact chargers yet. It is a 6 & 12 volt battery charger, battery maintainer, and battery desulfator at 1-amp for lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, and maintenance-free. It also charges lithium-ion batteries.
Charge down to zero volts.
Charge dead batteries as low as 1-volt. Or use the new Force Mode and take direct control and manually charge batteries down to zero volts.
Bring dead batteries back to life.
Built-in desulfation mode for the most corroded batteries. Auto detection with smart diagnostic indicators starts a Repair Mode integrated within a 9-step charging profile.
An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates.
24/7 Worry-free charging.
Provides all-season, all-weather charging for a healthy battery. Leave plugged in 24/7 with no worries of overcharging. Automatically returns to its last selected mode.
I HAVE HAD THEM ON A COUPLE OF 6 VOLT AUTO BATTERIES AND THEY SEEM TO BE WORKING FINE.
Noco products are great. No problems with any other chargers or jumpers I have purchased!
as described on web page