Previously ZOLL had recommended users either replace batteries every three years, or optionally upgrade their software to the current version (5.32) to detect battery problems within the maximum five-year standby life. We are now recommending that ALL users of the AED Plus upgrade their software to the current version (5.32).  

Our original offer to provide a sleeve of ten Lithium 123A batteries for $39.95 (including shipping) is still in effect.  Users who submit a valid serial number may still purchase batteries at the reduced price from this website.