DEFIBTECH – High-Use Battery Pack (DBP-2800) What makes this battery pack so remarkable is the duo batteries that are included in the battery pak. the primary battery DBP-2800 and the lithium 9-volt battery DAC-410. The primary battery DBP-2800 powers the AEDs primary function of analyzing and defibrillation during a rescue The replaceable 9 volt battery, powers the unit’s self checks leaving the battery pack available for a rescue. The 9-volt battery can be depleted and yet the AED will still deliver a shock as long as the primary battery is charged. Another great feature of the Defibtech High Use battery is that the AED will notify you by a chirping and the green indicator will flash red when the batteries are low. To check the status of the battery simply push the the power button down and hold for 2 seconds. The AED will then advise you to replace 9 volt or replace battery. The primary Defibtech High Use Battery has a stand-by life of 7 years installed and can deliver up to 300 shocks or 1600 hours of continuous monitoring and or rescue operations. The 9-volt lithium battery will need to be replaced once every 6-12 months. Each battery pack comes with a new DAC-410 9-volt lithium battery.