The Defibtech Lifeline AED battery pack contains a replaceable 9 volt battery that powers the unit's self checks leaving the battery pack available for a rescue.

• The primary Defibtech Battery has a stand-by life of 5 years installed and can deliver up to 125 shocks or 8 hours of continuous monitoring and or rescue operations.
• An expiration date is printed on every Defibtech AED Battery and can be found on the manufacturers label affixed to each battery. Please be aware that although the primary battery is rated for 5 years the 9-volt lithium battery will need to be replaced once every 6-12 months. If the 9-volt battery is depleted the AED can still be used and will still deliver a shock as long as the primary battery is still good at that time.
• If either of the batteries needs to be replaced the AED will chirp and the status indicator will flash red rather than green. To determine which battery is causing the alert simply press the power button down for 2 seconds and release. The AED will then verbally report whether it is the 9-volt which needs to be replaced or the primary battery by stating either "replace 9-volt" or "replace battery".