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Archive for April 1st, 2014

Monthly Science: Early Lithium Cell Failures

During my monthly data logging, I replace any weak CR2032 cells in the Hobo data loggers and, being that type of guy, I write the current date and the elapsed time since the last replacement on the top of the cells. This month I had to replace two cells:

Energizer CR2023 - early failures

Energizer CR2023 – early failures

Huh.

It seems the previous Energizer CR2023 cells in those loggers lasted for more than the usual year, but these cells from the same lot with the same date code failed in two weeks (my last monthly science was unusually late, because distraction). The YA date code (printed on the other side of the cell) isn’t helpful (that Q&A  list shows the problem), but they’re supposed to have an eight year shelf life. As nearly as I can tell, these are getting on toward five years on my shelf, so maybe they spent a bit more time on somebody else’s shelf than the seller claimed.

I’d previously slandered one of the Hobo loggers by accusing it of high current drain, but it turned out to be different crappy batteries.

I know they encrypt the date codes so we can’t buy the freshest retail batteries, but I don’t have to like it…

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