BuW GoingPower 14.4V 2200mAh Laptop Battery for ASUS A41-X550 A41-X550A X450 X452 X550 R409 R510 Black Battery type: Li-ion; Capacity: 37Wh; Cells:4-cell; Voltage: 14.4V;Capacity:2600mah. High quality grade "A" cells. Charges quickly. Longer discharge time. Steady output and low power consumption. More than 500 times charge-discharge cycles.All products are Certified by CE ROHS UL1642 FCC for safety. Operation time for standard batteries(4-cell 2600mah): Around 1 hours the actual operation time will depend on how much electricity is required by the device and how you use it. 24 x 7 email support 12-month service. Compatible Models: For Asus A41-X550 A41-X550A A32-X550 X550 X550A X550B X550D A41-X550 A550C A550 F550 F552 K450 K550 P450 P550 R409 R510 X452 Series replacement notebook laptop battery batteries 12-months hassle-free warranty service. Please check if this battery is compatible with your computer before purchasing. Part numbers of compatible batteries and Computers are listed as following.