A single Intellisense® battery is all that is needed to power your Powerheart G5 AED. This dependable, medical grade battery is tested rigorously at Cardiac Science and then self-tested every day in your Powerheart G5 AED. Using patented Rescue Ready® technology and embedded circuitry, your Intellisense battery communicates performance condition, age, storage temperature, and other vital information directly to your Powerheart G5. Each Intellisense® AED battery comes with a 4-year performance guarantee.