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 tested each day it is installed in your Powerheart® G5 AED for presence and functionality to ensure readiness. 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. Once Intellisense™ supplies are installed in your Powerheart G5 AED, years of unmatched performance are delivered. In fact, each Intellisense AED battery comes with a 4-year performance guarantee.