Philips HeartStart defibrillator batteries carry a 4 year warranty and 5 year shelf life. Standby life (after insertion): Typically 4 years when stored and maintained according to directions provided in Owner’s Manual.
The Philips HeartStart M5070a defibrillator battery has the capacity to deliver a minimum of 200 shocks or 4 hours of patient monitoring.
The battery typically last 4 years after installation keeping your Philips AED in "ready to use" condition as well as running mission critical self tests. Note that using the AED in the course of an emergency rescue or training activity will place a greater drain on the battery and lessen the install life.