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Maxell CR2032 Lithium Cell: Early Failure

The Hobo datalogger buried in the dirt under the patio kvetched about a low battery, which produced this surprising result:

Maxell CR2032 cell - early failure

Maxell CR2032 cell – early failure

Cells from the same lot have been doing just fine in the other dataloggers, so I hope this is a one-off weak cell and not the harbinger of another run of dead cells.

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  1. #1 by madbodger on 2016-12-26 - 09:19

    Alternatively, there could have been a leakage path.

    • #2 by Ed on 2016-12-26 - 14:33

      I’d believe leakage over six months, but not two!

      On the other paw, it’s buried in damp dirt, the O-ring may not make a perfect seal, and the tiny silica gel packet has long since lost its mojo. Sooooo, ya never know.

      I should gimmick up a tiny constant load and voltage monitor to test coin cells; the CBA lacks any accuracy below a few tens of mA, because that’s not what it’s intended for.