I think it is a LiPo someone here took some of them apart I believe it was KTMRider.
Eleaf Istick
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The battery I linked to is a Lithium Polymer (LiPo) battery. It says so in the description.
A full-sized 18650 Lithium Ion (Li-Ion) battery fits perfectly fine in the iStick. Some have already successfully transplanted VTCs in their iStick...
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Guilty as charged.
FWIW, it's the same size as a 18650 battery but what made me think it's a LiPo was the wrapper and ends. I also mentioned I could be wrong.
And in the blog, while the numbers are accurate, I don't think it takes into account of circuit efficiency, usually 5-10%. The Evolv DNA 30 require 12a input with a 10a output. I'm guessing they're on the safe side of the requirements though.
These are what 18650 high drain 3100mah batteries look like which are the same size as any regular 18650 3400s or the Ultrafire 5000mah batteries but are used for the 30w and 50w mods, APVs instead. 4pcs 18650 NCR18650A 3100mAh Rechargeable Li-ion battery 3.6V For Panasonic
The photo reduced in size and a little blurred shows just how large 18650s are when placed next to the iStick, MVP, Smok BEC Pro 50w APV, and Smok Vamo V5 3-15w APV as well as which type of 18650 go to what type of APV to begin with.
Guilty as charged.
FWIW, it's the same size as a 18650 battery but what made me think it's a LiPo was the wrapper and ends. I also mentioned I could be wrong.
And in the blog, while the numbers are accurate, I don't think it takes into account of circuit efficiency, usually 5-10%. The Evolv DNA 30 require 12a input with a 10a output. I'm guessing they're on the safe side of the requirements though.
That I suspect would be closer to the 18500 size being a little shorted in length. Plus it would need to be narrower in diameter then the Efest batteries used on the Vamo V5 one place for those while the Ultrafire 5000mah batteries went into the aluminum bodied Smok ACE 3-15w mods. You have to remember Eleaf allowed for wiiring from the circuit card to the 510 connector as well as the card itself using a battery with a slightly narrower diameter.
The Description you Linked to says that they are 65.2mm in Length. So they should work fine.
When I took my 1st iStick apart, after the Dental Pick Incident, I measured the length of the Cell. It was 65mm. And there was enough room inside for a Cell that was 1 or 2mm longer.
Granted, there are some High Capacity 18650's out there that are 68 ~69.5mm Long. But you don't see them that much. Because they are Too Long for Many Mods.
BTW, thank you for linking to this. I wrote it and didn't even know I had been published.
Got vape mail today, my acrylic top cap and my bending adapter showed up. Should have my fatdaddyvapes v3 510 tomorrow 
Oh and how will i know when the battery is fully charged? Does the batt icon stop blinking cause mines been charging for a while now
EDIT just as i said that the batt icon went out...lol
EDIT just as i said that the batt icon went out...lol
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I find it Curious that you are Basing your Conclusions on pictures you see on the Internet. And not on what People who have Held the iStick OEM Cell in their hands. And have Physically Measure it.
Yes... The Charging Icon will stop Blinking. And then the Screen will go Blank.
So i have been wanting to vape higher but i do lung hits now over mouth to lung and it seems the higher wattage with bvc coil doesn't really produce good flavor or vapor tbh. I am down to 6.8 watts and it's a decent vape with alright flavor, using the largest air hole. maybe i got a bum coil or am i just vaping wrong...lol
Don't Worry or get too Hung Up on the Numbers on the iStick's Screen. They may be off from the Numbers you are used to seeing.
Just start Low and move your way Up.
Good catch, KTMRider. Those values were simply crunched numbers based on a 90% chipset efficiency. As batteries age, they degrade and their internal resistance rises, lowering their performance. Companies, with today's litigious behavior, are smart to err on the safe side of things. I believe a good rule of thumb for safety's sake is 10A battery for 20W and 15A for 30W. 9A & 12A are probably plenty sufficient. But with the batteries that are readily available, 10 & 15 seem like good round numbers.
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The battery inside an Istick is PHYSICALLY identical to a 18650, which is just numbers measuring the battery size. 18 = 18mm diameter, 65 = 65mm long. There are questions as to what the last digit means (some think it's tenths of a mm). The reason I question whether it's a LiIon or LiPo is because the ends are more like a LiPo than LiIon.
Most 18650 batteries are 65 - 69mm despite the specs. IC protected can often be longer. The Istick can accomidate a longer battery. If I had to guess, about 69mm at most.
And some words of advice... If you ever want to be taken seriously in a discussion about high performance batteries (or any for that matter) do NOT talk about any xxxxxFIRE batteries. Especially ones that claim they're 5000mah. There is no such thing. The highest capacity for 18650 batteries currently is 3400mah.
QFT
Those are flat top not button top batteries and why they are a couple of millimeters shorter.
BTW, thank you for linking to this. I wrote it and didn't even know I had been published.
Well someone else read it and apparently published it for you!
I don't base anything on pictures but the one thing you seem to be overlooking which would be "FACTORY SPECIFICATIONS"! Without knowing just what type which seems to be LiPo not IMR Li-ion type plus what the battery is rated for when telling people it's ok to just go ahead and put any 18650 in I hope you are ready to replace what goes up in smoke! OOPS!
Often companies will special order batteries made to a certain specification according to product design. Once you decide you can put anything in just because it looks the same.. ut oh.. I suspect what you might learn will be these are not the same as what is sold over the counter in that sense. Otherwise they would sell them without any battery like any other 18650 mod where you stick in the battery of your choice.
I'm not telling Anyone to put Any Battery in their iStick. Only commenting on your Insistence that the Form Factor of the iStick Battery is Not 18650.
Which it is.
As to some "Special Order" Battery in the iStick. Really? In an APV that has a Wholesale Line Item price of less than 18 Bucks. And was designed around a Round Cell that was 18mm in Diameter. And 65mm in Length.
ETA: BTW - What is the Maximum Battery Continuous Amp requirements for an iStick?
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