New 7.4V 25.9Wh 3500mAh Built-in Battery for CTL J2 J4+ J2+X J4+X "NBBJ2J4" Internal Rechargeable Li-ion Polymer Battery Pack Voltage: 7.4Vdc Capacity: 3500mAh/25.9Wh 1 Year Warranty Fits CTL Computer Models: J2, J4, J4+, J2+X, J4+X Replace Part Number: SR466789-2S1P 21CP5/67/89-1