Any flashlight that uses 2 18650 batteries?

[Banzai]

Flashlights that use 2 x AA are aplenty... but 2 x 18650 ?
Would a 2 x 18650 battery flashlight give a flat output as 2 x CR123 (if the body is interchangeble...) for a given "pill"? eg if Olight M20 Warrior has a new battery body that fit 2 x 18650 using the same R2 engine it is using now, will it give a better flat output + longer runtime than 2xCR123 ?

 

[Kabible]

The M20 is rated to run on two RCR 123 3.7v cells so if a battery tube extension were used with two 18650 cells, then the light output would be regulated as with two RCR 123 cells but with longer runtime.

 

[chew socks]

The Dereelight CL1H and DBS with 3SM pills and an extension tube can run 2 18650 (and i believe 4 CR123's also work with the extension tube)