Coin cell nomenclature

In a recent interchange with Rick Sparber I mentioned intelligent nomenclature systems. My wife asked me if I had a 2430 lithium coin cell for her alarm clock. I didn't but in searching around I discovered that those coin cell numbers have meaning.

The first two digits are the diameter in millimeters and the last two digits are the thickness * 10 in millimeters. Thus a 2032 is two centimeters in diameter and 3.2 millimeters thick.

Maybe this is common knowledge among the electrocicers but somehow I never ran across it before.

Occasionally had to source odd coin cells too. There are charts online that sort by voltage and size; I hadn't noticed correlation to physical dimensions.

I wonder if the intelligence that designed this rather simple measurement system didn’t then decide to make hundreds of different combinations of those sizes and throw in voltage, current and battery type variations just to annoy us.

Yet another good reason to adopt the metric measurement system!

Sorry, but I guessed you meant the last 2 digit divided by 10 - not * (times) ?!
Günter in Germany / used to mm,hi

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Originally Posted by Bony

Yet another good reason to adopt the metric measurement system!

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Be careful here; nomenclature systems are not part of measurement systems unless specifically called out in the governing documents. I'm sure that the metric documents do not call out the way to name (number in the case of coin cells) a product.

However, folks who use metric are probably drawn to its simplicity and regular features and carry this organization over into their naming.

Quote:

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Originally Posted by dc9lk-8

Sorry, but I guessed you meant the last 2 digit divided by 10 - not * (times) ?!
Günter in Germany / used to mm,hi

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thickness (mm) = last two digits / 10

same, same as...

last two digits = thickness (mm) * 10

Hi, Marv!

Again...your last writing is correct (mathematically), but that is not the same as what you wrote
in your first statement. Keep your eyes on "thickness (mm)" is not equal to "thickness * 10 in millimeters", isn't it?
Also IMHO it is not done to use centimeters and millimeters in one equation if pure math is concerned as well as
all mesurements should use an equal number of digits behind the decimal point.

If I'm totally wrong I will still admire all of your articles in this forum!

Pse all of you members keep healthy!
Yours
Günter ( sri for any misspelling because learning english has been many moons ago as I've got more than 70 windings on my spool)

Speaking of measurement nomenclature, "more than 70 windings on my spool" is most unique description of that condition I've heard