Sorry it’s a link to a vaping guy…but he gets TONS of sweet deals
He just posted this
There is a new set of batteries coming that promise to raise the bar in amperage. If this holds true we have a new monster battery on our hands. Depending on how the tests roll-out these may be the highest amperage 18650 and 26650 to date.
Ok battery geeks and flash light junkies - have at it!
Impressive but the capacity is really low 
Not if the current is correct, but it is a bit tricky with connections when working with 60A in small devices.
Even 60A batteries is nothing new, A123 had even more: 70A continuous and 120A pulse
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But at a slightly lover voltage.
70A direct drive?
i see Flashlights cooled with liquid nitrogen… 8)
who have test the IMREN 18650 40A ?? batteries , if the test results didn’t arrived 40amp , they would be cheat their customer . 
This light with the battery trimmed for single cell use, direct drive, emitters parallel for 5A each. Install XM-L2's with direct copper mcpcb's. 19 thousand lumens and probably a new hole in the ozone layer if you point it at the sky.
This MNKE 26650 3500 mah battery’s maximum pulse discharging current is 60A
These batteries have a discharge rate of 40A and 60A. You can see in the picture what their mAH ratings are. Seems reasonable to me. Li-PO batteries made for hobby R/C cars are available with discharge rates well above these.
It’s a pity A123 went out of business. I thought those things were the shizz!
@DavidEF whist rc (lipo) batteries have always outperformed, they do not come in cylindrical form.
Be careful with these high current ratings, some (probably most) of them are puls ratings and they do not specify how long puls you can use.
I have just partially melted the wrap on a 50A rated cell, when doing a 30A discharge.
Here is a high discharge rate Li-PO battery for R/C cars. Notice the “150C” rating:
http://www.maxamps.com/Lipo-6500HC-74-Pack-N.htm
Now, here’s an explanation of what that ‘C’ rating means:
edit: For those who don’t want to bother with following the links, here’s a breakdown. The first link shows a 6500mAH battery pack with a rating of 150C. The second link says that the ‘C’ means the capacity, and the number of the ‘C’ means how many TIMES capacity the discharge rate is. So, the battery at the first link would have a discharge rate of 6.5A X 150 = 975A discharge rate!
It also has a price of about $140USD!
For those not in the know with rc STAY AWAY FROM MAXAMPS!!!
They are the biggest scammers in rc with their over rated lipo’s.
Period
With the high capacity and super high discharge rate of some of these batteries, and the capacity some of the guys on here have for fabricating flashlights, I’d think the non-cylindrical shape would be worth working around!
Yes indeed. You also run into other problems with such high amps though - high heat, low efficiency and lack of suitable led’s. Current batteries can serve current drivers that serve current led’s.
The thing that led has over most other light forms (incan, halogen, etc…) is efficiency. Lipo’s could be more useful in big HID lights.
Thanks for the warning. I’m one of those “not in the know with rc”. But, there are still plenty of other places that sell at least up to 3800mAH 60C battery packs. That still translates into a discharge rate of 228A! Well above the batteries shown in the OP. I just wanted to let people know that the batteries in the OP are not just alien technology or cartoon technology. Stuff like that really exists in our world. The part they don’t tell you is that the discharge rate sword cuts both ways. A battery with a 60C continuous discharge rate would be finished in one minute, possibly less, if it were actually to be used at that rate continuously.
Hobbyking is said to be a good store for RC stuff and batteries
http://www.hobbyking.com/hobbyking/store/index.asp
Ok, fair enough. One point to note though, as HKJ pointed out real life test/applications can be very different from stated specs. Most of the battery industry is somehow unregulated and they all have there own way of “testing” to come with “x” and “y” values for a given battery. So it is hard to know what is a good battery (even in rc)???
In regards to maxamps, I haven’t rc’d in a year or so but when I did I learned maxamps started in someones garage in the US. They bought cheap chinese (possibly seconds) cells and assembled them in the garage then over stated the specs, put a flashy label on and advertised the hell out of it. Result was a hoard of unhappy customers but because of the influx of noobs to rc they kept in business.
Here is one of my first eye openers about lipo’s
+1
I think everyone knows about these guys
i think now that we are seeing the next wave of high amp batteries… samsung 20r 25r, sony vtc4 vtc5, efest 35a, sony 50 26650, etc etc… the next thing I am interested in is going to be how each holds its voltage through a discharge curve.
I remember the sanyo 2600 18650 ur fm batteries were very good at holding a higher voltage and used them over many panasonic options for some time