Smallest 18650 zoomie is the Aleto N8 Aleto N8
Good luck finding one though. The only supplier I found who sold them was a single Ebay seller. Last I checked I could no longer find a listing for this light.
Stock they are something like 108mm with a decently wide flood mode and fairly tight (for an XML) spot mode due to the fairly long focal length lens.
Quite moddable too. I modded mine extensively, and got it as short as 91mm … remarkably short for an 18650 zoomie. Modding the Aleto N8
I’ve continued to tinker with it though. In current form, my Aleto N8 is 94mm long. I gave it a unique optic system that gives it a super-wide flood beam… 136 degrees. Something like 4x as wide as a Sipik 68 floodbeam. Spot mode isn’t that bright though, only around 13k lux (actually less now that I reduced the current in the driver).