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Best batteries are Sony VTC5A, vtc6. However I am strongly recommend Samsung 30q. I like it so much and bought 16 of them from illumn.
They are $5.50 each for the 30q button top.
Thanks everybody for the information I will go with the Samsung 30q.
Good idea, the VTC6 won’t keep its capacity over many cycles like the Samsung 30Q would.
I have not heard such a thing. Where are you getting this info?
Typically these cells get used hard, so by the time they have 100+ recharges on them they get replaced anyway. So capacity loss over time is usually not that big a deal.
Anecdotal evidence at best, people of this forum, CPF and vapers complaining of lost capacity and higher IR after the same number of cycles as the 30Q. Generally well over 100 cycles though. Give me some time to reference these very unscientific posts. Don’t get me wrong they perform the best in my lights, but capacity over time does matter to some more than others. 
Thanks maukka, I have read that thread and had a hard time finding it. More threads and data linked below.
It looks like there is a little bit more capacity loss on the VTC6 than 30Q. It’s a small percentage. I think people get too anal about capacity. It really only comes into effect if you discharge them down to 2.8v or so.
If you don’t normally run them to empty and/or recharge them at too high a rate, capacity loss should not be an issue. Remember that 200 recharge cycles is a lot. If you recharge it once a week, every week, it will take 3 years. I’ll probably have the newest batteries before that happens.
For me, I usually recharge my cells once they get to 3.6v or 3.7v. I charge my 18650 cells at 1A to 1.5A. So capacity loss is something I don’t even think about.
I think I would give the 30Q a bit more preference over the VTC6. Both are good, but the 30Q is a bit better.
I also hear good things about the VTC5D.
Most of the issues I have read is that higher current draw magnifies this capacity loss. So if they are used in high lumen lights, the lifespan is significantly shortened. Checkout the graphs from the last link in my previous post. Specifically page 8 and 9. I have read better things about the VTC5D, but not everyone has the luxury to spend money on extra cells. I personally love all my cells like pets and take good care of them, but I consider that a privilege that not all have. I know I certainly did not have have that luxury when I was first started reading posts on this forum in 2014 before I ever made an account, I was poor and read forums to buy the best performing and highest longevity batteries.
Charging with 4A and exceeding 80°C while discharging is some hardcore testing though. Wonder how big the difference is in real life conditions.
Even at 7.5 amp hour discharge rates there is a noticeable impact. Certainly many lights achieve that. That is with a 4ah charge rate. But never reaching such high temps, check out kronium.cz
My MF02 arrived today. It is the updated version with the new button and anodization.
You're welcome.
received mine. Seems to work with evva 3500mah(ncr18650ga). Maybe it could be brighter with 30q but it´s very bright allready.
Price: $95 ( $145.95 )
Coupon: 8860E1
Option: Cool White or Neutral White LED
could i get a coupon for MF02S NW
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Intrested
Interested. Your above coupon expired.