Our state of the art Asus X501A compatible notebook battery is designed and manufactured under strict European ISO 9001 standards. It meets and exceeds high priced OEM products, allowing you to power your computer with a superior quality battery for a fraction of the price! Compatibilities: Laptop models: Asus X301 Series, X301A Series, X301U Series, X401 Series, X401A Series, X401U Series, X501 Series, X501A Series, X501U Series, Battery models: A31-X401, A32-X401, A41-X401, A42-X401.