The ASUS C21N1509 and C21N1347-2 are high-quality replacement batteries designed for ASUS laptops. The C21N1509 offers a 38Wh capacity and 7.6V voltage, ensuring long-lasting power and reliable performance for models like the X556UA, X556UB, and X556UF series. The C21N1347-2 provides a 37Wh capacity and 7.5V voltage, compatible with models such as the X555LA, X555LD, and X555LN series. Both batteries feature lithium-ion technology for efficient charging and extended battery life, making them perfect for users seeking dependable power sources for their ASUS laptops.