LB1 High Performance 6600mah/73wh Battery for Dell R48V3 / RU485 / T54F3 / T54FJ / UJ499 / X57F1 / YKF0M Battery Type: Li-ion; Capacity: 6600mAh/73Wh; Cells: 9-cell; Voltage: 11.1V. 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. Compatible with: Dell R48V3 / RU485 / T54F3 / T54FJ / UJ499 / X57F1 / YKF0M