Introducing the all-new Genius5EU, one of our most powerful, highest-performing, energy-efficient, and compact chargers yet. The Genius5EU is a 6-volt and 12-volt battery charger, battery maintainer, and battery desulfator rated at 5-amp for lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, and maintenance-free, plus lithium-ion batteries.