Question about battery safety and <.2 ohm vaping

[Redlist]

Hey everybody, long time reader, first time poster here. Go easy!

I've been vaping for about 6 months and my rda builds generally fall no lower than .4 ohms. I've studied up on battery safety and after a lot of ready and forum cruising, the Sony VTC seems to be a pretty regular go-to for sub-ohm vaping. I have a couple of these and among other batteries, I'd have to say they're a great go-to.

One thing I'm trying to understand; a lot of these cloud chasers are rolling coils as low as 0.06 ohms. Some use these Sony VTCs. But with a 30 amp limit on these batteries... do the math and the safezone is about .2-.3 ohm resistance. They're going significantly below that.

I know there's always risks, but is there more to know here or are these guys just dangerously abusing their batteries?

 

[KenD]

They are dangerously abusing their batteries

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[maxd]

these guys just dangerously abusing their batteries

 

[DavidOck]

And eventually going to be giving the ANTZ and media more horror stories about how dangerous vaping is.

And with a coil that low - the contact resistance of threads may be higher, so a lot of the energy is going to be heat there as well... so the question then is, really, what's the point?

 

[State O' Flux]

One thing I'm trying to understand; a lot of these cloud chasers are rolling coils as low as 0.06 ohms. Some use these Sony VTCs. But with a 30 amp limit on these batteries... do the math and the safezone is about .2-.3 ohm resistance. They're going significantly below that.

I know there's always risks, but is there more to know here or are these guys just dangerously abusing their batteries?

Allow me to play Devil's Advocate... from both sides of the fence. ;-)

It's an applied considered risk (which might just be a more scientific'y term for being an ignorant dumbass) - and from a pure nanny state, safety standpoint... perhaps a foolish one, or perhaps they are our vaping equivalent to the crash test dummy.

From spec sheets, we see the Sony VTC5 has a continuous rate of 30A and a momentary or pulse rate of 60A... however, they don't state the length of time for the pulse rate. Is it 5 seconds... 10... 30? I honestly don't know, nor do I know if Sony is being a bit conservative, and there's a margin of safety 'envelope' beyond that 60A.

So... 0.06Ω at 4.2v is a 70a current draw. At this rate, although a (potential) 4.2v charge occurs only briefly, we've exceeded the manufacturer's highest (published) rating. After than first discharge... the charge drops, to what? 4.1v, 3.9v? Again, I honestly don't know. Not until we reach 3.6v, does Ohm's Law parity fall into line... at 60a, and that's just the math of it.

I suppose that these folks are going by the "The mech ain't hot yet - I still have both my eyeballs... so I must be doin' OK" rule of pushing the battery performance envelope.

I'm not anyone's mother... so if folks want to run with scissors, pet the strange pit bull or look down the barrel of a .45 to see if it's loaded... I'll not be the one to keep them from their 'destiny'.

 

[KenD]

There's nothing nannystaty of being careful below 0.2 ohms (and I'm in a different country, which truly is a nanny state, you wouldn't believe it). Beyond that, your measuring equipment just won't be accurate enough, unless you're Tony Stark. At 1.3 (or similar) you're just too close to a dead short

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[Baditude]

Anything below 0.2 ohms is rolling the dice of fate. You're putting a lot of faith into a cheap $18 ohm reader box made in China to measure your coils accurately. You're rolling the dice that you don't accidentally nudge one of the coils when you remove your RDA cap and drop the resistance. In other words, you are 0.2 ohm from a dead short and a battery going into thermal runaway.

 

[zoiDman]

...

One thing I'm trying to understand; a lot of these cloud chasers are rolling coils as low as 0.06 ohms. ...

.06 Ohms @ 4.2 Volts is Only 882 Watts.

 

[State O' Flux]

.06 Ohms @ 4.2 Volts is Only 882 Watts.

Just a "pocket version" of the Legal Vape 4000. ;-)