... A33-U50 Capacity: 5200mAhVoltage : 11.1VColor : BlackProduct Type: ReplacementBattery Type: Lithium ionCompatible Part Number:Asus A31-U20, Asus A31-U80, Asus ... U80V, Asus U81, Asus U81A, Asus U89, Asus U89V Laptop Battery with 6cell 5200mAh Capacity Replacement Battery for U20 U30 U50 U50F