Thank you for this great question, I would be happy to assist you. When it comes to our coin cell batteries, if you do not see "best use by" on the back of the packaging, then you should be able to find a 2 or 3 letter code embossed on the back of the package, you would then have to call our office so we may provide the date of manufacture and best use by date for you. Since our coin cell batteries have a shelf life of anywhere from 3 to 8yrs, the manufacture and use by date could vary. I do apologize for this inconvenience.
Thank you for taking the time to contact Energizer.
10 months ago