Great question and very important. Powerheart battery 9147-201-TSO has a 2-year stand-by life (life while installed in the AED and in stand-by mode). The 9147-201-TSO battery has a "manufactured on" date printed on it. This means you have a 5-year shelf life (new and uninstalled). So the expected expiration date is 2 years from the date you install your battery as long as you install the battery within 5 years of the manufacture date.

This Cardiac Science Intellisense battery is a non-rechargeable battery that is compatible with Powerheart AED G3 Aviation models.