The DVD-40 Modified 12V-12V is a Heavy Duty Portable Charger with dual independent 12 volt outputs that can deliver a full 20 Amps simultaneously. This product charges a lead acid battery as fast as is chemically and electrically possible without causing any damage. It is perfect for both flooded cells and Absorbed Glass Mat (AGM) sealed batteries. (Note: Please allow 2-4 weeks for shipment of this unit).