An automated external defibrillator including: a reserve power source for providing power to defibrillate a patient, the reserve power source including: a reserve battery which requires activation to produce power an activator for activating the reserve power upon one of an electrical or mechanical activation a pair of terminals operatively connected to the reserve battery for outputting the produced power to electrode pads configured to supply the produced power to a surface of the patient and a stop for preventing the activator from activating the reserve power source, the stop being selectively removable when activation is desired.
