Egoway New Laptop Battery for Asus X550 A41-X550A A550 F550 F552 K450 K550 P450 P550 R409 R510 X452 Series - 18 Months Warranty [Li-ion 4-Cell 2600mAh] Battery Type: Li-Polymer; Voltage:14.4V; Capacity: 2600mAh; 4 Cell. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. About 500 recharge cycles over the life of the battery. Overcharger and Discharger Circuit Protection, CE-/FCC-/RoHS-Certified for safety Operation time for standard batteries: Around 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it. Warranty: 18 warranty, 30 days money return guarantee, 24 x 7 email support.