Oh i see lg he4 for 3,65 a piece, must go order some 
I can’t comment on ordering quantities like that, but Fasttech is legit. I have personally purchased Pansaonic and Sanyos from them that were 100% authentic.
Thanks mhanlen 
They used to be more popular around here before they started catering a lot more to the vapers than the flashlight community. Also some of their prices went up, and other retailers started popping up that were less reliable- but cheaper.
That means that you still don't have FET driver or DD driven light :)
HE2 vs 30Q???
Regardless of price which should I get?
HE2 are great, 30Q are great, newer, and a little better capacity. The 30q compare now with the HG2. All three are great cells.
Which one is The most affordable one in Wh/dollar? Still being a decent battery in other regards too.
can you find HE2s cheeper than “At 3,75€ nothing beats the ncr18650pf”
This one looks really affordable too:
Fasttech has them at $4.69 but you have to buy 4. So, no, not cheaper than the PF. The HE2 is a better battery than the PF for high drain applications.
So, the PFs at NKON is probably not a bad buy…
In my eyes the age of the cell is important too, new cells seem to give higher amps…
I've done quite a bit of testing over several DD lights, all single cell, some single LED, some multiple LED's. The ony choice in my mind, not factoring price, is the HG2 or 30Q, and the 30Q did slightly more consistently better than the HG2 - not much more. I would consider them (now) equals since the differences have to be within the margin of error. Earlier I really thought the 30Q was superior. Funny because both are Korean cells, so wonder if they share technology or components, etc. They do seem to release cells in the same range of capabilities and capacities. Final manufacturing may have some variations, but maybe not much.
You have to go with a higher capacity cell- these 30Q's and HG2's do seem to hold high amps longer. Same here - I was begging HKJ to test these, but, he had his priorities and queues.
shrick - I've bought a lot of cells from FT over the years and never got fakes.
brown turds or pinky rosey... Great choice 
Thanks for your input Tom…
For every day use though, you can't beat the 10A cells. I've started with the PD's, then PF's, BD's (I think), and the LG 3200 mAh cells, now I got a few of the SANYO GA's and ordered some of the LG MJ1's. The high amps cells are great for quoting instantaneous output at 0 secs fully charged (pretty useless really), but for real usage, you'll find GA's in my lights - much more consistent, not insane droppage and insane heat - they work great with spring bypass's and all the tweaks - more output with some decent consistency.
My Post #4998 in https://budgetlightforum.com/t/-/31076 re-printed here:
Was curious how these cells compare in an A6, so, I did a shoot-out compare of the Samsung 30Q vs. the LG HG2 cells in a BLF Manker A6 with the 3D XP-L, and what the effect is of adding the bypass's on the springs:
Operation in Order |
Sam Q30 #1 |
Sam Q30 #2 |
LG HG2 #1 |
LG HG2 #2 |
Volts measured |
4.21v |
4.22v |
4.22v |
4.22v |
Amps measured |
4.39A |
4.35A |
4.38A |
4.27A |
0 – 10 secs (lumens) |
1190-1122 |
1241-1176 |
1275-1193 |
1268-1193 |
Volts measured |
4.18v |
4.19v |
4.20v |
4.19v |
--- Tail spring bypass added --- |
||||
0 – 10 secs (lumens) |
1411-1340 |
1428-1343 |
1401-1333 |
1401-1333 |
Volts measured |
4.16v |
4.17v |
4.18v |
4.18v |
--- Driver spring bypass added, Nyogel applied on threads --- |
||||
0 – 10 secs (lumens) |
1506-1411 |
1503-1408 |
1503-1397 |
1523-1408 |
Volts measured |
4.14v |
4.15v |
4.16v |
4.16v |
--- Cells Re-charged --- |
||||
Volts measured |
4.22v |
4.22v |
4.22v |
4.22v |
Amps measured |
5.47A |
5.45A |
5.38A |
5.36A |
0 – 10 secs (lumens) |
1564-1425 |
1554-1421 |
1530-1411 |
1537-1414 |
@30 secs (lumens) |
1360 |
1353 |
1343 |
1350 |
I let the light cool down between battery tests, at least cool to the touch of the head, and little more. It may not have been long enough - I'm not sure.
Seems to be a pattern the HG2 cells did slightly better before bypass's, while the 30Q's did better afterwards. Differences though are slight, probably within the margins of error.
Certainly for all, the output droppage is pretty high, but for such a small light, not unexpected. Maybe better bonding of the MCPCB to the pill top may help, or even thicker wires.
I’m surprised that no one mentioned the purple Efest IMR 18650 2500mAh. Usually rated near the top in high drain 18650s.
Mike
I suspect the EFEST's are a simple re-brand/relabel maybe packaged better. I've tested my EFEST 35A's against 25R's, HE2's, HE4's, VTC5's and they do well, but do not consistently beat the others. Could be because my EFEST's are dated, not sure. Also my VTC5's don't fair well against the other 2500 high amps cells, but again, could be because of age and use. I also have AWR 2500 high amp cells (yellow wrapper) that do well - right there with HE2's, etc., but suspect they are a re-label also.
Any recommendations for protected cells for multi-cell flashlights?
Did you also notice:
“NOT protected! Don’t buy this unless you know what you are doing!
This battery is NOT for flashlights!
Yes, I know these batteries can be dangerous (tick-Box)”
Shame, I was going to buy some for my “LED Hosts”!
I assume you mean in series, not parallel. I have no hesitation using unprotected cells in parallel (soup can or COURUI D01), as long as I know I have quality cells and got some sort of working LVP. The protected 10A cells are pretty nice - ones MtnE has I'd highly recommend -- I will basically only buy protected cells from Richard now because he ensures the protection circuits are a good design. The MH1's, MJ1's, and GA's are all good for me.
KeepPower's are decent but KP has cheapened out some I've bought, and swap cells under the wrapper, had a history of mis-labeling, etc. - I don't trust them as much as I used to.