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Lithium battery shelf life question
Posted by: freeradical
Date: January 11, 2019 09:48PM
Why do AA and AAA batteries have a 20 year shelf life, but 9 volt batteries only have a 10 year shelf life?
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Re: Lithium battery shelf life question
Posted by: pqrst
Date: January 12, 2019 07:34AM
Good question. My uneducated guess is that because a 9v is made up of multiple cells (vs single cell for aa) that the shorter life span is just factoring in increased likelihood of an individual cell failing. Also the much smaller size of the cells increases the chance of failure. My two cents.
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Re: Lithium battery shelf life question
Posted by: Bill in NC
Date: January 12, 2019 08:07AM
They'll likely last well past 20 years, at least for the AA/AAA size.

I have one 123 battery (now called CR123A) bought in 1983 or 1984 that is still good.



Edited 1 time(s). Last edit at 01/12/2019 08:08AM by Bill in NC.
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Re: Lithium battery shelf life question
Posted by: RAMd®d
Date: January 12, 2019 02:33PM
a 9v is made up of multiple [smaller] cells (vs [a larger] single cell for aa)

Bingo.

I think.

The multiple points of failure of a 9V battery is most likely a somewhat distant second cause of shorter shelf life but possibly the leading cause during its duty cycle.




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Re: Lithium battery shelf life question
Posted by: freeradical
Date: January 12, 2019 03:30PM
That explanation makes sense.

When I worked in Wideband Communications in the Air Force, microwave and tropo scatter links used frequency, polarization, and space diversity to create parallel paths which improved system reliability.

Stuff in series = less diversity



Edited 1 time(s). Last edit at 01/12/2019 06:09PM by freeradical.
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