AGPtek 10.8V 6cell 4400mah ASUS Laptop Battery Replacement For ASUS S401A1 Series S401U S501 S501A S501A1 S501U X301 X301A X301A1 X301U X401 X401A X401A1 X401U X501 X501A X501A1 Series, Compatible with the Part Numbers: A41-X401, A42-X401, A31-X401, A32-X401 Type: Li-ion. Voltage: 10.8V. Capacity: 4400mah. Cell:6. Dimension: 268.5x42x23mm. N.W: 450g Full One year warranty! Certificated by CE & Rosh!! Replacement For: A31-X401, A32-X401, A41-X401, A42-X401 Package List: 1 x Enhanced battery for Asus X401, 1 x AGPtek warranty card, 1 x Battery FAQ, 1 x USB SD Card Reader