HKJ did a test on those EFEST 26650 IMR’s
Seem pretty good to me.
Yeah FT. You mean the C-shaped dent in the photos on their listing?
I think that is a stamp impression where the cell roll is internally welded to the case. It may be a manufacturing defect, making these seconds, but if it didn’t puncture or severely weaken the case, they should be good to go.
are you using these series or single cell?
ten amp discharge is a lot, what are you up to? because I want a piece of it. Sl3 mod?
Until 10A panasonic pd is the best over this the Samsung 20R is better…Use hkjs comparator to compare a Panasonic pd with some 26650s…
It's for single cell multi-emitter use. I might be getting a light in for review with which I would like to test with a high quality cell (just in case it significantly helps for output). Besides, I'd like to have some good cells anyway :) . I'm thinking to get some Panasonic NCR18650PD's.
-Garry
I couldn't find the Panasonic PD listed in the comparator.
EDIT - Ah! It's these Enerpowers!
EDIT #2 - Using HKJ's Comparator the Efest 26650 IMR's easily beat out the Enerpower/Panasonic 18650 PD's!
-Garry
I hope the 26650 IMRs can beat the 18650 NCRs in a current supply race! 
From a price comparison, now that’s a different story. 
Well I am looking at the ability of the 26650's to hold higher voltage.
And interestingly enough I see the two types of 26650's I already own (TF Flame 26650 & King Kong INR) also hold higher voltage than the Panasonic PD's. I was guessing the PD's might at least beat the TF Flames (well, they are better than "Fake" flames I'm sure).
-Garry
I didn’t even notice that image on the FT website. When I first got them, I took one out of the package and threw it in a new light. I thought the brass spring sleeve had screwed up my new cell. I had the whole ail assembly taken apart before I realized the other three cells were the same.
I have some more coming from DoingOutdoor. I’m curious to see if they are the same.
If 3.2 volts under heavy load are enough, how about LiFePO4:
A123 18650:
A123 26650:
I have both types of batteries and their ability to deliver insane amounts of current is simply incredible!
My PD’s from doing outdoor are the same. I figure they are meant to be like that.
26650s beat 18650s in holding voltage, that’s what they are really good for…I learned that with the BLF A8 which has really nice runtime
The Efest 26650s are really nice if you don’t consider the miserable capacity.
What about paralleling some 18650s?
I tried once to order efest batteries but never got an invoice, I am really confused about their shop.
With these currents the protection circuits are suboptimal as they steal voltage, I have seen some nice tests here from night crawl or so which compares the Panasonic PD with the Samsung20r and the conclusion was that the Panasonic are better(almost same voltage but more capacity) below 7A and from that the samsung is better. So HKJ graph from the enerdan PD is different…
Here it is
But if you can use 26650s than this doesn’t matter anyway…until you go in the 15A field
I thought those Moli IMR 26700’s were considered top notch. You get 5 new for around $35-45 in a Milwaulkee V18 pack on ebay. Why are you all willing to pay $15ish/cell for the ones mentioned above?
I make my living in heavy construction. My company bought in to the Milwaukee V28 li-ions when they first came out 5 or so years ago. As the batteries have died I have been able to harvest on average about 4 cells out of the 7 cell packs. They are Emoli IMR 26700’s and rated for EXTREME withdrawal currents. They are too long for some lights but fit most of mine. I mainly buy 26650 lights nowadays because of this nearly inexhaustible supply of batts for free! Sometimes all 7 cells are flat, other times only 1. Check those discard bins at Lowe’s and Home Depot!
I'm afraid I might run into length issues with the 26700's. I don't have the light in hand yet. About the Efest 26650's, thanks to ecigs I can get these cells from numerous US sellers. I'm afraid to ask to dive into the battery recycling bins! Each battery is also wrapped in a plastic bag (at least at my HD).
-Garry
Although I’m not above saving cells from recycle bins, I was recommending new since that is what you seemed to be looking for. Best of luck on your search.
TF Flame 26650 cells seem to do OK then. I knew they hold up better than most 18650 cells, but I figured the PDs could hold up against a standard 26650.
In my case, I need the 18650 format for the BTU Shocker, and I wanted some capacity at the same time. Hopefully they provide at least some additional performance over my Sanyo ZTs.
Garry, in your case, it seems a 26650 is the way to go, and TF Flames (or KK ICRs) may be the best balance of budget and performance/capacity.
TF flames are not able to deliver 10A! The protection kicks in at 7A or so
And the biggest problem is that there a not many tests out there in the 26650 sector. I have found the soshine 26650s quite good for me but I would really like a test of them to compare them before i can recommend them.
for me it was the only opportunity for cheap protected 26650 which can deliver 9-10A.
Not many? How many do you need, I have tested 10 different 26650.