| 4-Bank, 8A (2A/Bank) Smart Car Battery Charger, 6V/12V Automotive Charger, Battery Maintainer, Trick... Meet the GENIUS2X4 - A four-bank battery charger for charging multiple batteries. It's the all-in-one universal charging solution - battery charger, battery maintainer, trickle charger, float charger, plus battery desulfator. more | Bed Bath & Beyond | $299.49 FREE shipping go to store |