Coin Cell Date Codes - or Coin-cell are a little hard to find.
They are on the side of the battery - it is a two letter code. The second letter represents the year of manufacture. As an example if it says YN
They claim a 5 year shelf life - considered usable in this time.
Energizer should make date code information available on the packaging. They really have a responsibility to at least communicate how to read the two-letter-code, but they don't.
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