Paul Franklin wrote:
....
...used a Tadiran lithium thionyl chloride cell. This is a different
chemistry than typical lithium cells. ...These cells have extremely
low self discharge, but can only deliver relatively low current, so
are not suitable for high discharge rate applications. ...

In a former life we investigated them as a power source for a wireless
remote monitoring device for preventative maintenance prediction
monitoring, but couldn't get the required power, unfortunately. The
advantage would have been a great boon in minimizing access to some
really yucky places in paper-processing mills and power plants for a
couple of examples...

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