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Or a different battery chemistry with a lower self discharge rate. No need to be rechargable in most of the use cases, I'd imagine.



Panasonic BR2032 has 30µA discharge rate https://www.digikey.com/en/products/detail/panasonic-bsg/BR-...


If that's the self discharge rate then the battery would be fully discharged after less than a year on the shelf (given its 190mAh capacity). Coin cells typically have a much longer shelf life than that. I wonder what that figure is, exactly.


This sounds like a job for a lithium thionyl chloride battery.

The guys with the purple LiSoCl2 batteries make ones with up to 40 years of usable life




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