Upgrade your ASUS X51 or X51H laptop with this high-quality replacement battery. This 4400mAh Li-ion battery is designed to fit perfectly and provides a voltage of 11.1V. With six battery cells, this battery is built to last and offers reliable performance for your daily computing needs. This black laptop battery is compatible with the ASUS brand and is specifically designed for the X51 and X51H models. Don't let a weak battery ruin your work or entertainment experience. Replace it with this top-of-the-line battery and enjoy uninterrupted usage.