So this trial was meant to be testing a NEW CR2032 cell. I initially expected it would last about 2.5 years. So imagine my surprise after 90 days when the voltage was dropping quickly:
Close inspection of the battery revealed it was not one of the new batch I had brought. Rather, it was probably the battery I changed out of a car or garage remote. Like my eyesight, my memory fails me!
Anyway. I'll let it run for another day or two till it stops then put in a fresh new battery. It is encouraging that a flat battery ran for over 3 months since it makes my estimate of 30 months from a CR2032 cell look readily achievable.
Meanwhile, the AA battery just keeps powering along on track for 10 years of life.
Update - my maths was wrong. A new CR2032 should last perhaps 6 months. And a fresh AG3 cell perhaps 28 days.
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