The RO04XL replacement battery is a high-performance Li-Ion battery designed for compatible HP laptops. It has a voltage of 11.55V and a capacity of 41Wh, providing reliable and long-lasting power for your device. Featuring a 3-cell configuration, this black battery is easy to install and ensures optimal performance. It is backed by a warranty, offering peace of mind with your purchase. Before buying, be sure to check the model and part number compatibility to ensure the correct fit for your laptop.