The medical grade Intellisense battery is the power behind the Powerheart G3.  This dependable battery is tested rigorously at Cardiac Science and then tested each day it is installed in your Powerheart G3 for presence and functionality to ensure readiness.  Once Intellisense supplies are installed in your Powerheart G3, years of unmatched performance is delivered.  In fact, each 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 devices shipped after April 12, 2004.