Replacement notebook battery for HP Elitebook 8560W, 8770W; Elite Workstation 8560W, 8770W; replaces QK641AA, VH08XL, 632114-421, 632425-001 Specs: 10.8V, 8400mAh, 91Whr; 9-cells; Lithium Ion Warranty: 18 months from date of purchase