Overview Often, AED batteries don’t last as long as they should because most AEDs use their battery packs to power their regular electronic self-tests. Leave it to Defibtech to come up with a great idea in AED batteries! The Defibtech Lifeline™ or Lifeline AUTO AED standard battery pack contains a replaceable 9 volt battery that powers the unit’s self checks leaving the battery pack available for a rescue. Do you need a high-use battery pack? Defibtech and the AED Superstore® has those, too. We deliver all Defibtech battery packs complete with the 9 volt battery. Purchase an extra battery pack today. Use with the Defibtech Lifeline or Lifeline AUTO AED. The Defibtech brand AEDs operate on batteries only. Always have a fully charged spare.