The NewerTech NuPower Battery is a 65W Li-Ion battery specifically designed for the 13" Unibody Apple MacBook 6.1 and 7.1 models. Made with high-quality components, this black battery has a voltage of 7.6V and is compatible with the Macbook 7.1 product line. With 4 battery cells, this product provides long-lasting power to keep your laptop running smoothly for extended periods. Designed for convenience, this NuPower Battery is a reliable and efficient accessory for your Apple MacBook.