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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
This is not a consistent code - Seiko used the first letter for
the year ( F = 2015) and the second letter - less one - for the
For the Bunny brand:
code VI is supposed to mean 2016 - could be because V = 22 - the BIUB date? would mean made in 2016? 22-6 = 16? -
ZA = Use by 2022 - manufactured 2018 (via email) A-76
BI has no date on packaging (A-76) - manufacture date of 2016
KN - no use by date - (2014?) A-76
392/384 has ZC on packaging - nothing on batter (dishonest?)
ERC2031 has WC on packaging ( 2023? ) nothing on battery( shady
Might be time to start only using Japanese batteries -
Sony, Seiko, National = Panasonic, Mitsubishi - The
Leporidae based batteries look to have moved to China. The
lack of date code on the battery is really bad news.
Some manufactures claim a 5 year shelf life - considered usable
in this time - others more. If it says use by 2022 - it was
likely manufactured in 2017???
All reputable manufactures would 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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