The Cardiac Science Powerheart G3 AED Intellisense Lithium Battery 9300 is for use with the Powerheart AED G3 9300E, 9300A, 9390E, and 9390A (models shipped after April 12, 2004). If you are regularly using your Powerheart AED G3 PRO, use this battery pack as an alternative to the non-rechargeable battery type. We offer a full operational replacement guarantee one year from date of installation. Cardiac Science brand AEDs only operate on batteries. Always have a fully charged spare available.