The Lifeline replacement battery pack (DBP-2800) has a standby life (installed in the unit) of up to 7 years. This new battery has 300 defibrillation shocks, or 16 hours of continuous operating time. This includes performing daily, weekly, monthly and quarterly self-tests. Each battery pack also includes a new (DAC-410) 9-volt lithium battery that powers the self test indicator. The 9-volt lithium battery will last approximately 1 year installed in your device.(Please note that these are NOT suitable for the Lifeline View)Included:1 x Lifeline AED High Use Battery (7 years)1 x 9-volt lithium battery to power the self test indicator