Critical Power for Philips HeartStart FR3 AED: 989803150161 LiMnO2 Battery Ensure your Philips HeartStart FR3 AED is always rescue-ready with the 989803150161 primary battery. Engineered as a genuine-compatible power source for life-saving defibrillators, this lithium manganese dioxide (LiMnO2) battery delivers reliable performance when every second countsideal for hospitals, clinics, offices, schools, and public safety settings.