Possibly, min/max might be determined. What is the specific driver? Part of it depends on identifying driver chip(s) and other components, and getting their datasheets. Image if possible could be helpful.
Unfortunately a lot of driver chips used in flashlights and other small dc LED devices either
have "pseudo" markings which are hard to impossible to trace, or no marking at all
(presumably to protect the design from copying).
I'm curious what the actual inside dimension is on the latest (3rd or 4th gen?) ML50L tube both length and diameter [beyond the threaded section]. Will a 26650 with normal dimensional tolerance fit without risk of jamming? Can the cap spring compress enough to fit two 21650 in the 2cell? (I am...
I’m happy with the lumen output already. I would really like to be able to run this light on a pair of protected 21700 Li-ions. In a perfect world I would try to run it on a pair of LithiumWerks 26650 LiFePo4s. However, the tube is slightly too small or the batteries are slightly too large.
That's what I was thinking, 2x 26650 (or 26700, is that workable?) works out to about 3C, though I don't have any 3C lights.
I'd keep looking for someone who has done this specific change. Otherwise you'd have to do a possibly destructive test (not recommended), or dive into driver details which may or may not give a solid answer.
The 3AAA zoomie I accidentally damaged had voltage applied approximately in range of two Li-ion cells (maybe higher but don't recall). I suspect some drivers working at 4.5v might be good to 6v, but maybe not much higher.