this post was submitted on 26 Mar 2025
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Electric Bikes

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TIL that 18650 means 18mm x 65mm (imgur.com)
submitted 4 months ago by nucleative@lemmy.world to c/electricbikes@lemmy.world
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And there are lots of other sizes too, such as the huge 40135 (40mm x 135mm)

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[–] dual_sport_dork@lemmy.world 12 points 4 months ago

This is also true of coin cells, i.e. watch batteries. For instance, the ubiquitous CR2032 is 20mm in diameter and 3.2mm thick. CR2024 is the same but 2.4mm thick, CR2016 is 1.6mm thick, etc.