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