The battery for the Zoll AED 3 defibrillator has a lifespan of 5 years from the installation date. It’s important to monitor the battery status regularly and replace it when needed to ensure the reliability and effectiveness of your defibrillator. If you need to order a replacement battery for the Zoll AED 3 or have any questions about its use and installation, please feel free to contact us. We’re here to assist you in keeping your Zoll AED 3 defibrillator powered and ready for any emergency situation.