LB1 High Performanace New Battery for Toshiba Tecra R850-S8511 PA3905U-1BRS - 10.8V 6Cells (Black) Laptop Notebook Computer Battery Type: Li-Ion; Capacity: 4400 mAh/49Wh; Cells: 6; Voltage: 10.8 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. Live Support Mon-Fri 4am-8pm PST | Sat-Sun 8am-5pm PST | 18 Months Hassle-Free Warranty. Battery for Toshiba Tecra R850-S8511 PA3905U-1BRS