I agree. 26650 fits in my hand just fine and I do have a 21700 light too. People have a hard time accepting a thing for not being perfect to them, as if there desire represents all of perfection. The same goes for the 26350 tube, yes it’s inferior; so just don’t buy it rather than debating its usefulness or lack of virtue. Rant over.
I agree, but I actually was debating weather 26350 cells were useful or not,
I’m not a fan of smaller tubes myself , the only smaller tubes I have for my torches is for the blfgt ,but I only bought it to run 12 cells instead of 8 to get more runtime.
I’ve stopped myself from buying another D4S with a different emitter by asking is it more useful than what I have now. The full 26650 for me is the right length and the shorter tube would be too short. Others have said when it comes to size, a smaller diameter is easier to carry than a smaller length, I agree. But giving up any size dimension in this light just doesn’t provide any true benefit, as you say YMMV.
My mileage doesn’t vary , I agree :THUMBS-UP:
this agreeing malarkey feels very weird 
Well, the 30T can deliver substantially more power than any 26650 out there, so for an ultimate build the LH351D in W6 power bin using an 30T cell can deliver around 7600 lumens. Sometimes we build them because we can, not because we need anything different.
I did order my new blue D4S with the 26350 tube because I like the stubby configuration, no other reason than that. I have short D4 lights and I don’t have a short D4S light, but I will have soon. And this is how my collection grows to fill all available space…
Thank you for pointing out all of these advantages that I overlooked. I suppose the greater thermal mass advantage might be lost with a smaller 26350 tube?
26350 battery will never give as much power as 26650, it should deal much better with heat
So does that mean we shouldn’t expect the light to deliver as many lumens on Turbo with a 26350 cell? Is that because there are no high drain 25350 cells?
Pretty much that, the smaller cells can’t deliver the current their larger siblings can. The very best (Golisi Gold) 26650 can do some pretty staggering output numbers in the right light, but there are only a couple of options on the half cell (26350) and those aren’t as high drain. Be that due to their smaller form factor or just a different chemistry. They do ok, for the smaller size, still capable of 3000 lumens or more, and of course at 2000mAh they just won’t last as long in theory… in use the lower output and lesser heat allows the smaller cell to actually have a fairly respectable run time… all depends on how much you dog it in Turbo vs regulated use. 
Edit: For those relatively new to all this, the capability of discharge vs capacity of a Li-ion cell is rated in C, meaning C is the proportion of output to capacity in percentage. So the smaller cell with a lower capacity, like 2000mAh, might do 5C (10,000mA or 10A) while a really good 26650 with 5000mAh capacity might do 10C (50,000mA or 50A) Obviously, hitting the small cells with high drain will really result in decreased run time and a lesser life expectancy of the cell in number of charge cycles it can take. This is the kind of thing you have to keep in mind when purchasing the light and the cells to go with it, what is your intended use and which cells will run your selection accordingly. It all gets rather complicated of course, with different driver types ie: linear or direct drive versus regulated or constant current. There’s homework!
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I’m glad that was helpful. The performance differences between the D4 and the D4S are significant, but don’t really count as “features” so they are easy to overlook.
The smaller tube would probably have some impact, but not as much as you would expect. Someone posted some neat thermal imaging of a D4 running on turbo and the majority of the heat stayed up near the head. I expect the same is true of the D4S.
I got board after waiting 3 minutes for the D4s to step down, it takes a while to heat up ,but I do set the limit to 70*C , which actually work on ramping iOS ,its one of the best torches out there imo.
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Which battery 26350 do you recommend? I don’t see much where to choose apart from these two from Haikelite store.
Alex, that first link is to cells that look like the ones I have that work quite well.
There were several recommendations for the Schockli 5500mah IMR 30A. I bought two and eagerly await my E4S.
There are some Reddit posts with pictures of a D4Sv2 tail cap. Hank, what’s the skinny?
Thanks!
That’s 26650, not 26350 mate, but as far as 26650’s go that’s about the best you can get
My bad, but the Shockli is a winner.