The battery for the Defibtech Lifeline defibrillator has a lifespan of 5 years from the installation date. Regularly monitoring the battery status and replacing it when needed is crucial to ensure the reliability and effectiveness of your defibrillator. If you need to order a replacement battery for the Defibtech Lifeline or have any questions about its use and installation, please feel free to contact us. We’re here to assist you in keeping your Defibtech Lifeline defibrillator powered and ready for any emergency situation.