The New Genuine Original W540BAT-6 Laptop Battery is a high-quality battery designed for Clevo laptops. With a capacity of 4400mAh, this Li-Ion battery lasts 2-6 hours and comes with a 2-year warranty. Certified by CE, FCC, RoHS, UL, KC, it is compatible with various Clevo laptop models such as Aquado M1519 and Nexoc B509II.