This CMOS battery is an essential component for the HP Pavilion DV4000 Series laptops and ensures that the system's settings and internal clock are maintained when the computer is turned off. This specific battery is compatible with various models within the DV4000 Series and has a 3-pin plug for easy installation. What makes this CMOS battery even more special is that it is a refurbished product. This means that it has been overhauled and put back on the market after thorough inspection and any repairs. This ensures that the battery is again in optimal condition and reliable for daily use. By choosing a refurbished CMOS battery, you not only save money, but you also help the environment by reusing electronic components. It is a sustainable choice that is beneficial for both your wallet and the planet. This battery is of high quality and meets the specifications of HP Pavilion DV4000 Series laptops. It has been tested for performance and reliability, so you can enjoy a functioning CMOS battery without worry. Whether you're looking for a replacement battery for your laptop or want a spare just in case, this refurbished CMOS battery is an excellent choice. With its 3-pin plug and compatibility with various models within the DV4000 Series, it is a versatile and useful part to have at home. Choose quality, choose refurbished.