Cardiac arrest victims come in all ages and sizes. SMART Pads for the Philips HeartStart FRx defibrillator are safe for use on infants, children and adults. Electrode pads must be replaced after one use and should be replaced every two years. Build some insurance into your emergency plan. Order extra multipurpose SMART Pads for your HeartStart FRx AED! How fresh is your AED battery? Order replacement batteries for Philips HeartStart Onsite and FRx defibrillators here.