7 year Replacement Battery Pack (DCF-210). While installed in the unit this replacement DCF-210 AED battery has enough power for 16 hours of continuous usage (300 shocks) and will last for 7 years, with daily, weekly, monthly and quarterly self-tests to give you the peace of mind of knowing that you will never be caught without power. Each battery pack comes with a new DAC-410 9-volt lithium battery. Only compatible with Defibtech Semi AED (A27598) & Auto AED (A38578).