Here's a big one
Measuring in at 16mm x 8mm, powered by three button AG4/377 cells, XM-L2 emitter and all soldered brass construction.
This is a twisty light and works by the outer casings being filed at an angle so when it is twisted contact is made by the ends coming closer together, same principle as those hinges that raise the door as they open.
Max – 10lm
Current – 20 mA
Length – 16mm
Width – 8mm
Weight – 5 grams (with cells)