Used Red Redvolt Charger (QUAD) #740-0015

The REDVOLT Charger (Quad) is the most powerful way to charge up to 4x REDVOLT or 2x REDVOLT XL batteries. All batteries are charged simultaneously, with up to1.75amps distributed evenly to each cell until full.
The REDVOLT Charger (Quad) enables you to simultaneously and dynamic charge multiple REDVOLT or REDVOLT XL batteries in under two hours per battery. Includes a removable 6 foot IEC power cable.