The Intellisense battery is the power behind the Powerheart G3 AED. Genuine Powerheart G3 AED batteries are tested rigorously at Cardiac Science. Then your Cardiac Science G3 AED battery is tested each day it is installed in your AED for presence and functionality to ensure readiness. Once Intellisense™ supplies are installed in your Powerheart G3 AED, years of unmatched performance are delivered. In fact, each genuine, Intellisense AED battery comes with a 4-year performance guarantee. This Intellisense lithium battery is for use in Powerheart AED G3 9300E, 9300A, 9390E, and 9390A shipped after April 12, 2004.