Maximize your battery life for more games, videos, music, and photo viewing without having to plug in your AC adapter! This Replacement Laptop Battery has internal circuit board with chips that allow it to communicate with the notebook to monitor battery performance, output voltage and temperature. Replacement Laptop Battery also gives the notebook, accurate 'fuel gauge' capability to determine how much battery runtime is left before the next recharge is required. The Apple Replacement Battery Helps increase your productivity by achieving longer system run times than with just the standard system battery. Get the power you need whenever and wherever you need it for your iBook Series.The Replacement Notebook Battery does not only provides a stable working environment, but also enhances the mobility of the laptop!