Energizer Ultimate Lithium AA cells don't last forever

 I had the first cell fail.  It was installed in an analog quartz clock ("REGULATOR") on March 10, 2019.  I noticed that the clock had stopped on February 1, 2023 so almost 4 years of service.

I tried measuring it with the Metex DVM:

 open circuit:        1.491 Volts

 with an 18 ohm load:    less than .2 Volts (continually decreasing), decreasing current from about 28 mA

 with a 1.3 kohm load:    1.250 Volts, current .9 mA

The loads were from the Sears VOM on the 1.5V test and 1.5V button cell test switch positions.

Fortunately no leakage has occurred.  The Energizer applications manual pdf

https://data.energizer.com/pdfs/lithiuml91l92_appman.pdf

says that the electrolyte is a lithium salt / organic solvent, which sounds more benign than either the Sal Amoniac in carbon zinc cells or the potassium hydroxide in alkaline batteries.

As the cheapest person ever I might just hold onto this cell until some others also fail, I suspect several could still be used in series to power a PIC based project, especially if it has a low power regulator.   Or maybe use it alone to power a ZN414 type of TRF amplfied crystal set ?

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm