That is a nice collection of lights!! The 18650 is my favorite battery!
For those who don't know, and even fewer who care, this is why the numbering system is the way that it is on batteries. The first two numbers are in millimeters they are the diameter of the battery. The last two to three digits are in tenths of a millimeter and they are the height of the battery.
2032 button battery is 20mm diameter and 3.2mm tall
18650 is 18mm diameter and 650 tenths of a mm, or 65mm tall
Trits are a danger, I didnt know they were a thing until I began collecting lights. Didn't take long and was shipping them from halfway around the world, buying the special adhesive, UV light and installing them! There are customs that are "trit'd out" with a few hundred dollars of tiny magical glowing sticks

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