M5070A Philips HeartStart Battery for the Onsite, FRx, and HS1 AED Philips FRx, OnSite HS1 AED replacement 4-year battery on sale at AED Brands. Long-lasting Indispensable Sudden Cardiac Arrest (SCA) is a risk for any person and in any setting. In case of an SCA medical emergency, be prepared with an operative AED (automated external defibrillator) and a working battery. The Philips AED REF M5070A is designed for the Philips HeartStart Onsite AED (M5066A, M5067A, M5068A) and Philips HeartStart