Green Cell Batteri - Asus A550, P550, K550, X550 - 4400mAh
Source 4cell new 14.4V A41-X550 laptop battery for Asus A41-X550A F550 F450 X550 A550 K550 X550C X550E X450 X550J original battery 37WH on m.alibaba.com
Asus X550J 44Wh Replacement Laptop Battery for A450