LB1 High Performance New Battery for Asus K53S Series Laptop Notebook Computer PC [9-Cell 11.1V] Battery Type: Li-ion; Capacity: 6600mAh/73Wh; Cells: 9-cell; Voltage: 11.1 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. Compatible with: Asus K53S Series