Nope!
I have tested that particular cell and it is too long for the short tube.
Are you able to recommend me a capable battery for the shorty? I wan max capacity and max discharge. I dun care if it protected or not! Thanks! 
KeepPower (unprotected), Efest, NiteCore and Xtar are all good choices.
These are 18350 cells right? Not 16340?
Yes, all 18350.
THANKS! 
Thanks! So youāre saying that you built an s8 triple or you used the spacer from one? I wonder what the difference is.
Or did you mean you used the S2 spacer (the long one ā not the short S2+ spacer) and put it that spacer in a Convoy S8?
Hi guys, Iām sorry I was not clear. I used the longer spacer for the S2 and put it in the S8 host. The S2 and S8 used the same reflector and pill.
The convoy must be better at shedding heat. Must be the pill. It looks more heavy duty than the shelf in the a6. Thanks again tristanxoxo!
If a light gets hot faster at the same drive current as another with a similar mass pill it means itās conducting heat better not worse.
and a similar path ā Iāve been wondering why the inside of the X6 head is so empty, for example.
Does the A6 with the S2 pill conduct heat out to the exterior as effectively? Need foil wrap added?
Thatās the point. If you have two similar hosts(S2 & A6) both with similar copper spacers added running at similar currents the one that gets hot quicker has a better path. The heat is reaching the surface faster. To āhandleā it better, ie have just as good a heat path yet stay cooler one would need to either have more mass, more surface area, or have a bigger mitt wrapped around it.
I donāt think thatās the case here. My S8 was clearly able to maintain max output much longer than the A6. Also they are not very similar IMO. I didnāt weigh them, but the S8 host seems heavier than the A6. I think the size difference in the heatsink/spacer and perhaps the fins on the S8 might be the difference here.
Also I found the S2+ spacer was slightly too small for the shelf of the A6. It would have been more effective if it was a tighter fit.
Or the surface treatment ā emissivity is the measure of being able to get rid of heat by emitting infrared, and it can vary enormously even when the visible appearance to human eyes is the same.
Anyone tried doing infrared imaging of the lights, say, tailstanding over time?
Itād be interesting to know not only how fast the surfaces get hot, but how hot they can get and level off ā without frying something.
Personally, Iām looking for the steampunk revolution to finally reach flashlight design ā a little water jacket enclosure with a safety valve that pops and gives us a steam whistle as a heat warning.
Of course youād have to be very careful not to have a boiler explosion on your hands. Superheated steam is terrifying.
Been there, done that.
Giggle Youāre right. Steam is scary. But someone should totally build a water cooled light for the next build competition complete with a popoff valve!
Edit: Sorry. Way too easy to go astray at this place! Lolā¦.
Ooh - That was post #300 for me!
Iāve been astray for a long time. 
That makes sense in the way of getting the heat out and into your hand but can someone explain the difference between metals conducting vs. shedding heat? I know thatās why the x6v2 was not left completely stainless.
Bright, shiny metal is smoother on a microscopic level than anodized aluminum which is porous and rough giving it more surface area for heat exchange to air molecules. A vivid example differences in conductivity would be to hold a foot of bare awg 12 solid Cu in one hand and a foot of clothes hanger wire in the other and put the tips of each into a flame. It takes a lot longer for the heat to reach your hand moving up the steel wire so it would take longer for the heat to move through the steel of the SS part than the added Cu.
Donāt buy kitchen ware with copper handles.