Not that I know of, but I don't have anything 26650 anymore, as I traded away my only 26650 light with spare cell, so that is a moot point for me now.
Interesting thought though, and I never considered maybe unprotected 21700 cells would work in a 26650 light taking protected 26650 cells.
Didn't think or know flat-top 18650 cells would work in a 21700 light taking unprotected 21700 cells either, as I was recently made aware of, so I can talk with my buddy who got the 26650 light and maybe test with my 21700 cells.
