Dear OMers,
I have been talking with yet another manufacturer of 357
silver oxide cells. (Not Energizer or Duracell etc), who will remain nameless
as they were very honest about some issues with their cells. It appears
unlike the Energizer cells these cells have much shorter shelf life. These
cells loose capacity slowly in the first year ~2% and then accellerate loss
and after about 4 years they loose capacity rapidly. According to the
importer this is a result of chemical degradation not sealing but it is
probably both. This means it probably pays to refrigerate (not freeze) cells
like this if the cells are to stored for more than 1 year. If you do this it
probably pays to store the cells inside an insulator like polystyrene foam to
minimize thermal cycling from the door opening and the compressor cycling.
This is both a thermal expansion issue and a condensation issue. Bottomline,
the Energizers still look the best choice and don't need refrigeration for
long term storage.
Regards,
Tim Hughes
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