I ran a few additional tests including one were I took a freshly charged M11 Purple Vapcell and just ran the light continuously. Whenever I caught it stepping down, I bumped it back up to turbo. There was no voltage at which it would not bump back up but eventually the cell dropped close to 3.0V and although double clicking still worked, all of the output levels were greatly reduced and the light would throttle back to a lower level as quickly as I could double click it to "turbo." After doing this for a bit I eventually got the cell a little below 3.0V (a beater cell) and quit trying.
The overall impression that I had was that the light just kept going, which was surprising with these smaller cells. In fact, there was so much run-time available, even while constantly bumping to Turbo, that I would consider this light eligible for a "survival ruck" "get-home bag" or distance carry, where one could benefit from a 3.85oz, compact, limited use spotter, as supplement to a primary headlamp. So maybe you've got a dedicated headlamp for foot or bicycle navigation over distance but want to be able to identify some eyes in the distance or a trail marker, or a structure of some type and perhaps you only need it for 10-20 seconds at a time, I think this light would work well in this role. In the heaviest use scenarios, you could always plug it into a battery bank when the light is at rest and I noticed that the light operates, while connected and charging through it's USB-C port.
I have yet to take it on a proper desert hike or overnight outing but I'm finding it both fun and useful after a couple nights of walking and bicycle riding while comparing it to other "Mini" throw options.
