Coil size for 18350

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gpjoe

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Don't know your background, but if you are inexperienced with battery safety and current draw, best to study Ohm's Law and read a bit about max current rating on batteries. It's not about size as much as it is about resistance. You cannot go as low in resistance on an 18350 battery (compared to an 18650, or 18500 even) because even the best battery of that size cannot stand up to high current draw.

If you know all of that and are just looking for what other people are doing as compared to your builds - then ignore my post. I don't use any 18350 batteries.
 

AndriaD

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There's also the fact that the lower the resistance, the greater the amp draw, leading to far shorter battery life between charges. But "underpowered" would seem to indicate some fairly major voltage drop, which I know is a factor with some mechs, and perhaps even some APVs -- my Vamo seems considerably underpowered compared to my sigelei zmax.

But I'd have to second the opinion that if you're asking questions about coil *size* you perhaps need to study up on Ohm's law a bit before using a mech, and certainly before doing anything drastic with it (such as sub-ohm vaping -- very drastic!).

Andria
 

Rickajho

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Which battery are you using?

That would be a good starting point. And knowing what resistance coil you put in that RTA that you are trying to fire would help too. If you do not know the answer to either of those questions then maybe you should consider devices other than a mechanical.
 

Baditude

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Learn more about different batteries and about Ohm's Law as it pertains to rebuilding coils. Sounds like you're playing a dangerous game with current setup.

AW
18350 ​700mah 6 Amp (red)
18350 800 mah 12 Amps (new red)

Efest
18350 800mah 6.4 Amps (red)
18350 700mAh 10.5 Amps (purple)

Above are the 18350 IMR batteries available for personal vaporizers along with their amp rating (continuous discharge rate). Any other battery is the WRONG battery and dangerous.

Do not fire a coil which will pull more amps than the battery has to give, or it may cause it to fail and go into thermal runaway.

Never fire a coil without first measuring its resistance on an Ohm reader or digital multimeter.

Explain It to the Dumb Noob: Ohm's Law Calculations

Battery Basics for Mods

Information Resources for Your First RBA
 
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AndriaD

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wow - a 12 amp 350?

sounds like my .5 ohm stealth can be a reality.

oh, wait...
nevermind the stealth part.

Yeah, I think sweet-vapes.com has some of those; I got some of the newer 18amp 18490s. Yes they're an authorized AW reseller, and as a matter of fact, seem to have the best prices on AWs I can find (that are ACTUALLY AW batteries!).

Andria
 

crxess

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Nice to see a higher amp battery now available that keeps the Mah rating reasonable.

Follow Bad's advice on batteries and learn ohms law.
Battery life on a small 18350 is best around 1.5 or higher. However builds in the 1.0ohm range produce a better vape. (.8-1.4ohm)

Size = Diameter and number of coils(wraps)

Resistance is your concern.
 

WattWick

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Two things you may find with 18350s on mechs. The old red Efest are no good. They may be for 15-20 charge cycles... may be. After that you'll be lucky if you get more an a milliliter or so worth of vaping out of them. Get the new AWs or purple Efests.

And, you may want to aim for efficiency more than with bigger batteries. By this I mean getting a wire that is on the thin side. You won't be firing up big chunky 24 awg dual+ coils for more than a few tokes. I run mine with 28 awg at ~0.8 ohms. Good enough for me - decent vape time per battery. If I didn't use mesh, I'd try to up the efficiency a little by using thinner wire. 29-30 awg should do nicely.
 

Davantrac

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99% of the time I coil anywhere between 1 and 2 ohms, very rarely try above or below but normally mid way.
The rta I did try was lemo at 1.4 ohm using 28awg and 3mm diameter so should be ok according to the checks I've used and understand. The battery is a Torchy 18350 3.7v 850 mah. Torchy is a well respected battery seller in the uk.
 

crxess

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Sorry to say, everything I am reading points to Torchy being a good Flashlight battery, but not optimal for Vaping.
It seems to have a much higher internal resistance than High Drain 18350 IMR's in its class. 3x the resistance of an AW.
Torchy would work great at higher resistances but the vape would be poor.
 

Davantrac

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Sorry to say, everything I am reading points to Torchy being a good Flashlight battery, but not optimal for Vaping.
It seems to have a much higher internal resistance than High Drain 18350 IMR's in its class. 3x the resistance of an AW.
Torchy would work great at higher resistances but the vape would be poor.

How can you say that the batteries 3x the resistance of an AW from the details given? He is one the most respected battery dealers in the uk, and test all his batteries before dispatch.
 

Susan~S

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99% of the time I coil anywhere between 1 and 2 ohms, very rarely try above or below but normally mid way.
The rta I did try was lemo at 1.4 ohm using 28awg and 3mm diameter so should be ok according to the checks I've used and understand. The battery is a Torchy 18350 3.7v 850 mah. Torchy is a well respected battery seller in the uk.

What is the CDR of the battery?
 

Ryedan

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Sorry to say, everything I am reading points to Torchy being a good Flashlight battery, but not optimal for Vaping.
It seems to have a much higher internal resistance than High Drain 18350 IMR's in its class. 3x the resistance of an AW.
Torchy would work great at higher resistances but the vape would be poor.

AFAIK, Torchy is a seller not a battery brand and I think he knows his stuff. Have not bought from him because he's in the UK and I'm in Canada though, so I have no personal experience with him. OTOH, if I moved to Europe I would definitely check him out :)
 
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