Extremely interested!
My back-of-the head calculation was: 1.1V (already under load! +losses) to 3V@1A = 3A in —> Eff. dipping below 50% —> 6A in. (And then further V_in drop etc.)
This particular converter shuts down at 4A I_sw, that’s where it ends.
When the efficiency curve is that steep it doesn’t make much sense to make detailed calculations anyway. It’s a dynamic system, and it just goes bad, fast. One problem exacerbates the other and vice versa. That’s the bottom line.
You could, in theory, run 2 switchers in parallel and share the load, but then the battery still remains the weak link.
With all this in mind, what’s a reasonable output?
I think the sweet spot is around 200 lumen, a good balance between output and runtime. Seems to be what most AA lights have settled at. (Although some still step down from that, for some reason.)
Keep in mind, 90CRI has a bit of an impact too.
Interested
This would be awesome!
Correction
This is what would be awesome!
I’m interested!
Interested
This is turning out great. Now I’m definitely interested in 4 or 5 of these especially if the price is not so far off the SP10B. Also interested in a couple of drivers if they become available for purchase.
Interested.
Are you talking about something like webcam cover?
or more like remote control cover?
The second design would fit more this new 2AA flashlight from Sofirn 
Interested
uuuh interested 
Anduril on an AA light? If that happens, sign me up for several! I guess I’d better keep a closer eye on this thread!
Interested.
Nice project :). Interested
Interested
interested
>sliding cover
either kind, whatever’s available that could be adapted without reinventing the wheel.
Thanks to Rost333 above, for finding those examples.
Here’s another
https://www.aliexpress.com/item/32898609281.html