I read in a review that high drain batteries would actually boost quite a bit a multiple emitter light output… using several 18650 in parallel - i think it was the Solarstorm T4, not sure.
Now that’s makes me wonder how safe it is? It seems to me like a catastrophe waiting to happen…?
Why? :-/
A big part of that safety is on you. Quality cells only. Cells bought together and used together. Your example is 1s4p so not quite as scary as say 3s3p. You should have no problems being only run at a single cells voltage you’ll have some cell leveling, which is normal and safe and only happens when the light is on. In 2 series or greater cell leveling is not always a good thing and should only be done with the very best cells;Panasonic,LG,Samsung and only with protected cells. In these cases a weaker cell may be pulled below charging voltage while the rest are slightly higher in voltage. The danger set up is a handful of unknown cells running is series.
Not to ramble too much but those cells are drained together, used together so only very slight differences in voltage should exist.
1+
Be sure all cells are the same voltage before you load up the flashlight. Otherwise the higher voltage cells can “charge” the lower voltage ones, at an unknown rate. The current could be very high, potentially harming the cells. Charging or discharging at higher current than it’s rated for is abuse to the cell. And of course abused or damaged cells can become dangerous.
Thanks for the advice. I’m aware of the precautions using multiple cells… same brand, same batch if possible, same age, same state of charge… It’s just that with unprotected high drain there is absolutely no safeguards and a lot of current available. Better not inserting one cell the wrong way! Humans can fail…
I’ll give it a try see how it performs, but i’d rather play it safe.
In a DD light that doesn’t automatically have adequate thermal protections in place, the light can get so hot that the cell wrappers melt. This could potentially lead to a short depending on the light’s design.
In the beginning of my flashlight-hobby, I only bought protected cells. Then I got a light with 2 18650’s in series, which didn’t work with any protected cells I knew of and I had to get 2 unprotected ones for it.
Since then, with the highpower BLF-lights and others like them, I’m slowly switching to unprotected, high drain cells in all my lights. They really make it much easier, they give all the power any light need and they fit into any light…
And of my current lights, I guess the Acebeam K60 with 4 LG MJ1’s in series is the most “dangerous” one… Hopefully it doesn’t kill me! 
The most I could possible see that light the you listed drawing is 2.5-3 amps per LED. Two quality cell could carry that load, fours a cake walk. Be smart so you don’t have to worry. You said it “same brand, same batch if possible, same age, same state of charge” As far as a wrong way cell you’re partially protected, the cell wrapper goes over the side and covers part of the bottom keeping contact from a flat plate. Your cells are only electrically connected when the light is on. Enjoy the light BE HAPPY. Take the light run it on high/turbo for 15 minutes then check cell voltage. I’m pretty sure they’ll all be within 0.02v of each other.
Lol 
I thinks i’m just starting to drift that way too… trying to cool down some fears and gather opinions i guess.
Thanks for the tip! Damn i didn’t realize that! In S configuration it’ll work too, preventing two negative sides to make contact. I’ll keep that in mind indeed.
:-/ You have to check to confirm that all of your cells are like that though. Since some cells don’t have wrappers that extend over the edge. The LGs that I’m using at the moment don’t.
I’ll keep that in mind too!