LB1 High Performance New Battery for Asus U52F Part #'s: A31-U53, A32-U53, A41-U53, A42-U53 Laptop Notebook Computer PC [8-Cell 14.4V] Battery Type: Li-ion; Capacity: 4400mAh/63Wh; Cells: 8-cell; Voltage: 14.4 V 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 Asus U52F Part #'s: A31-U53, A32-U53, A41-U53, A42-U53