I shouldn't have been so lazy and just done the math to start with. I don't know how accurate they were, but one web site listed the 14500 as 51.5mm long. That's the one I used. I suspect these things vary in length a little from manufacturer to manufacturer, but nothing the spring compression won't make up for.
I wouldn't bank on that; I was trying to find a 18650 for a bottom-feeder once. I bought one online that bottomed out the spring & still would have needed maybe another millimeter. The next one needed a magnetic spacer.
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