The B31N1535 battery is a high-quality replacement battery for ASUS laptops, suitable for models such as RX410U, U4000, UUX310Q and U4000UQ. It has a large capacity of 4240mAh and provides long battery life. This battery is designed with stable lithium-ion technology to ensure safe and efficient power supply while minimizing energy loss. It has built-in protection circuits to prevent overcharging, overheating and short circuits, thereby improving overall durability and performance. The B31N1535 battery is lightweight, easy to install, and fully compatible with the original ASUS system to support the optimal performance of the laptop. Its high energy density can extend the time between charges, making it an ideal choice for users seeking a reliable and long-lasting mobile power source. This genuine replacement battery provides excellent value and performance at a very competitive price.