Is The Date On A Battery The Expiration Date. It also allows you to determine the age of your battery and whether it is still covered by the warranty. Therefore expiration date is useless.

IEC 60086-1 requires a primary battery to be marked with the expiration of a recommended usage period or year and month or week of manufacture. A manufactured-by date an install-by date and an expiration date. Another straightforward way to determine battery age is to buy the battery new as a replacement for one that went bad.
The AED is compatible with these types of pads.
Knowing the battery age can help in your diagnosis. The pads have a limited shelf life and should not be used beyond the expiration date. Battery expiration dates are based on the date when the self-discharge rate will be more than 20. The expiry date is rather arbitrary.

