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What's the 0 for in 18650?

Discussion in 'Off Topic' started by apacheguy, Aug 24, 2017.

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  1. apacheguy

    apacheguy S Sig #255

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    Stupid question.

    21 70 (ie Model 3 cells) means 21 x 71 mm

    18 650 (i.e. Model S cells) means 18 x 65 mm

    So why isn't it 1865? Why is it 18650?
     
  2. Troy

    Troy Active Member

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    The 0 means the form factor is cylindrical. I guess Tesla decided to keep it simple.
     
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  3. apacheguy

    apacheguy S Sig #255

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    Ok, but to be consistent it really should read 21700, right? The Model 3 uses cylindrical cells too.
     
  4. McRat

    McRat Active Member

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    #4 McRat, Aug 24, 2017
    Last edited: Aug 24, 2017
    On the smaller cells, you need the digits.

    First two are dia, the next 2 or 3 are length or thickness.

    A 2032 (you've seen these in fobs and other things) is 20mm dia, and 3.2 mm thick.

    So a 18650 is approx 18mm x 65mm (like many things, this is not exact)

    A 21700 is correct but so is 2170 since there is a not a 21mm x 7.0mm cell yet.

    They should probably stick to the 21700 designation. There is a 2354 which is pretty close to what a true 2170 would be.
     
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