... 8 steps output voltage 2,High-current output 4.5A max. 3,High capacity 50Wh laptop battery 4 ... 2V10.USB OUT current:2A( constant ) ; 2.5A( Max)11.Input Charging Voltage:8~20V 12.Charging ... down if demand current over MP3450D maximum output 4.5A.V.Packing accessories:VI. Product clear picture: ... rechargeable universal battery bank 8~20V/4.5A high capacity for Laptop, netbook, ,DVD,tablet PC ...