LB1 High Performance Laptop Battery for HP 630, 631, 635, 636 Notebook PC Battery Type: Li-ion; Capacity: 4400mAh/49Wh; Cells: 6-cell; Voltage: 11.1V Manual Troubleshooting Premium Grade A cells ensures peak performance and reliability. Operation time depends on the capacity of the battery, laptop settings, power consumption of equipment, and how you use it. CE-/RoHS-/FCC- Certified and Built-in circuit protection ensure both safety and stability; 18 Months Hassle-Free Warranty. Laptop Battery for HP 630, 631, 635, 636 Notebook PC