An external defibrillator having a battery； a capacitor electrically communicable with the battery； at least two electrodes electrically communicable with the capacitor and with the skin of a patient； a controller configured to charge the capacitor from the battery and to discharge the capacitor through the electrodes； and a support supporting the battery, capacitor, electrodes and controller in a deployment configuration, the defibrillator having a maximum weight per unit area in the deployment configuration of 0.1 lb/in2 and/or a maximum thickness of 1 inch. The support may be a waterproof housing.
