Our medical grade Powerheart® G3 AED battery is specially made to work with your G3 AED. Cardiac Science Intellisense battery circuitry works with Rescue Ready® technology to communicate battery performance, capacity, and other vital information directly to your Powerheart G3. Your genuine G3 AED battery is tested each day for presence and functionality to ensure that your defibrillator is ready in a sudden cardiac arrest emergency. With Cardiac Science replacement batteries, you can expect years of dependable performance. In fact, each Intellisense® battery comes with a four year performance guarantee.