I got the DQG 26650. I like it.
But I took on myself the task to find the ideal flashlight.
So now I’m gonna downsize a bit.
There aren’t many 21700 flashlights. The ones I saw are big.
But keeping the sizes of the DQG Tiny 18650 and 26650 in mind the size I’m after is:
97mm long and about 23mm diameter.
Preferably multi-led.
Anyone knows about such a light?
Is DQG working on 21700?
23mm diameter is going to be basically impossible when the diameter of the battery is 21mm. That would leave a maximum wall thickness of less than 1mm after accounting for clearance between the battery and wall.
Also, 92mm long leaves just 22mm for the tailcap, springs, driver, LED, optics/reflector, and glass.
The shortest 21700 light I can find is the Zebralight SC700, which is 108mm long, but has a 38mm head diameter.
The Acebeam EC65 is 114.5mm long, with a 27mm tube and 30mm head.
The Rofis MR30 is 126mm long, with a 29.8mm bezel.
Those are the most compact 21700 lights I can find at this time. While there are likely to be more compact options in the future, I still think your size requirements are going to be unreasonable.