After thinking about this light some more, I have to agree that 20700 would be the better battery format since basically none of the big battery companies make a 26650 that I can see. But I guess it should be possible to adapt from 20700 to 26650 size slot to use one in a D4S. Might have to find someone to print an adapter though, I’m not finding anything commercially available.
Some of the protected 26650 cells are 700mm long. I doubt this light was designed to work well with protected cells but I wonder if some thought was put into accommodating some of the larger/longer cells and if they could work with a 21700 or 20700. The D4 doesn’t seem to have extra long springs, but perhaps this one will…
Is there really a new version of the DQG avaible? I have only seen V3 up to now.
I also consider the D4s too big compared to the DQG, and would have preferred a 7 LED variant. Now I have to use the DQG for my planned RGBA + 3x white build - which is way more difficult due to the serial LED setup and the driver design.
It’s probably worth noting that the li-ion cell’s self-discharge rate is faster than that, so it probably won’t actually last 20 years per charge. But if the driver and LEDs were the only source of drain, it looks like it should last a couple decades based on how low the power draw is.
Effectively, there is no difference in terms of battery life between the low aux LED mode and off.
Not every flashlight has to be “edc”-small. This looks like a fantastic light for a backpack/bag, car, maybe even jacket pocket carry for an outdoor event. I’m into it.
I have a D4 MCPCB at home. I will measure it just tell me what dimensions you need. In D4 the screw holds the MCPCB and two legs of the optics resting on the screw. So if we make like D4S and same screw holding down the aux pcb you need to cut off more from the legs on screws. Maybe you need use longer screws also.
Edit: I think less leds are also enough. like 6 or 8.