The ASUS C31N1911 VivoBook Laptop Battery is a high-quality replacement battery designed specifically for ASUS laptops. With a voltage of 11.55V and a battery capacity of 3640mAh, this Li-Polymer battery provides long-lasting power for your device. It is compatible with the ASUS VivoBook model C31N1911 and comes with a manufacturer warranty of 1 month. The sleek black design and compact size make it easy to slip into your laptop bag, ensuring you have a reliable power source on the go.