Yes, I’d say the tip wires touched something. Those long bare copper tips you have there can go in too deep. Better to leave on some insulation or use very short bare tips, so as to limit the depth to just enought to make contact and hold the wires in place.
Tip: I found it better to use longer Dupont connectors to give more flexibility to the cabling, and to tape the wires to the head to prevent unwanted movement during flashing.
Except there are now two vias, one at each end of the row of four pads. This is an improvement over the D4V2, and will help to locate the pogo pins with much less fiddling around for those with less than perfect eyesight.
With most of the gadgets and accessories and tools I buy, I look for ones that have flexibility in mind, whether it’s in how many jobs it can do or if it can work or survive in a pinch with a different add-on. I like flashlights that can use a few different cells or combinations depending on what I have at hand. I think it’s a relatively common mindset.
My only issue with 26650 and 21700 compatability is the springs. Will a shorter cell rattle? Will a longer cell crush?
I’ll have to weigh some… the 21700’s are 5mm narrower but also 5mm longer so the size issue should very nearly be a wash…
Edit: An 4500mAh 26650 Golisi Gold is barely a half ounce heavier than a 3000mAh Samsung 30T, so I really can’t see weight being a problem. True, the 26650 is almost a quarter of an inch wider, but it’s also the same measure shorter. So again, the differences are so small as to be very nearly unrecognizable. If you are so close to failure at carrying weight that a mere 1/2 oz could make or break you, then the problems you face are much larger than which battery selection to choose.
I understand that carrying a wider light, even less than a quarter inch wider, in silk suit pants might well be problematic, but then, anything of any comparable size would also be an issue. At which point, pocket carry would have to be dismissed and a belt carrier figured out. This light offers unparalleled output for it’s size, and it does that by using a readily available 26650 format. Granted, the 21700 is making inroads towards popularity in Li-ion cell choices but still it’s availability is much more limited than the 26650.
A neck light may well be of consideration if carrying a flashlight is problematic. Output and run time will suffer, but then, that’s what compromise is made of…
E07 is more EDC friendly than D4S and they have the same head diameter
But apart from the size, I sold all my 26650 lights and cells, I’m only keeping the ones that also accept 21700, I’m done with having a lot of battery sizes
If I calculated this correctly, the 21700 cell is 83.36% of the 26650, yet the 26650 has 50% more capacity. So the 26650 is much more efficient for the capacity it holds vs it’s size. I probably missed something somewhere, usually do.