Ohms law/ Battery danger info

[GreMos90]

So I looked around to find out but never got a straight answer so I figured I'd ask here. I 100% comprehend Ohms law and utilize it in every build in regards with the battery specs. I built a coil awhile ago and when I put it on the ohm meter it was .35 ohms so I was like darn... Can't use it. At the moment I have a Efest IMR 18500 3.7v 1100mah to use until my bad boy battery comes in. So here's the break down!

So given the battery is a 3.7v but at full charge would be 4.2v that's the number I plugged in. So that makes 12A of power-a-flowin' but my battery is only rated for 8.8A.... So I mean it doesn't take a genius to see the 3.2A difference.. That being said what's the dangers of having more sucking than blowing? ( ) but really.. What's the risk? what's the danger? What's the possibility of thermal runaway?(and what is thermal runaway).... Basically, anything you want to tell me about this I'll be appreciative and I'm willing to learn more! Thanks in advance y'all !

 

[Btsmokincat]

With an IMR like the 18500 you have, hopefully it would just get hotter and hotter until it vented hot gas. That's thermal runway as I understand it, once it gets to a point it will just get hotter and hotter until it blows. IMR's are more likely to vent gas but have been known to explode.

We really need Baditude to chime in with his battery expertise!

 

[GreMos90]

With an IMR like the 18500 you have, hopefully it would just get hotter and hotter until it vented hot gas. That's thermal runway as I understand it, once it gets to a point it will just get hotter and hotter until it blows. IMR's are more likely to vent gas but have been known to explode.

We really need Baditude to chime in with his battery expertise!

Well they both sound like the equally suck lol.. I would rather not experience any of the two

 

[Btsmokincat]

IMR's that can handle the amps are relatively safe to use as long as you are careful.

The difference being IMR + Thermal runaway = venting hot gas versus Li-Ion + thermal runaway = venting fire and explosion.

I use Sony VTC4's with a .4 ohm coil without any problems everyday.

 

[anumber1]

Yep. Don't do it.

Even a "safer" IMR battery will vent hot gas, perhaps violently. Depending on how your mod is vented (is it?) you may be holding a pretty potent pipe bomb. That hot gas your overly stressed battery may vent has to go somewhere.

 

[Btsmokincat]

Yep. Don't do it.

Even a "safer" IMR battery will vent hot gas, perhaps violently. Depending on how your mod is vented (is it?) you may be holding a pretty potent pipe bomb. That hot gas your overly stressed battery may vent has to go somewhere.

Yeah he knows not to try it. We already beat him up pretty bad in a previous thread. Sorry GreMos90. Once you get the 30 amp batteries, vape away on that .35 ohm coil. Just if you notice the mod or atty getting really warm give it rest for a few minutes.

 

[GreMos90]

Yep. Don't do it.

Even a "safer" IMR battery will vent hot gas, perhaps violently. Depending on how your mod is vented (is it?) you may be holding a pretty potent pipe bomb. That hot gas your overly stressed battery may vent has to go somewhere.

Yeah I thought so. I wasn't planning on doing it I just wanted to get he info on why it's a bad idea

IMR's that can handle the amps are relatively safe to use as long as you are careful.

The difference being IMR + Thermal runaway = venting hot gas versus Li-Ion + thermal runaway = venting fire and explosion.

I use Sony VTC4's with a .4 ohm coil without any problems everyday.

Vtc4 has a 30A discharge rather than my current 8.8A a .4 ohm wouldn't hurt at all ever

 

[Btsmokincat]

Yeah I thought so. I wasn't planning on doing it I just wanted to get he info on why it's a bad idea


Vtc4 has a 30A discharge rather than my current 8.8A a .4 ohm wouldn't hurt at all ever

So long as I don't get a short in my coils, over drain the battery or vape until it get's super hot. There's no guarantee though, I could be vaping tonight and the thing suddenly get's too hot for me to hold. At that point I will throw it as far from me and anything flammable as I can. "Sub-ohming" with a mechanical does not come without it's risks but how I love to blow nice fluffy clouds! As long as you're using a good battery and carefully make your coils you'll be ok!

 

[AquaJoe]

The danger is the battery exploding. But more than likely it will just get warm and it shorten the life of the battery. Its rated at 8.8a continuous discharge, but it can probably do double that in pulses. The sony vtc4 has a 30a continuous discharging rate, but can pull 120+amps in short 1 sec pulses.

Honestly, I would not chance it. Wait until you get better batteries or rebuild the coil.

 

[GreMos90]

The danger is the battery exploding. But more than likely it will just get warm and it shorten the life of the battery. Its rated at 8.8a continuous discharge, but it can probably do double that in pulses. The sony vtc4 has a 30a continuous discharging rate, but can pull 120+amps in short 1 sec pulses.

Honestly, I would not chance it. Wait until you get better batteries or rebuild the coil.

I don't plan on using it all I have many atomizers just rotating safely haha. Be another week before me 35A efests come in.

 

[edyle]

So I looked around to find out but never got a straight answer so I figured I'd ask here. I 100% comprehend Ohms law and utilize it in every build in regards with the battery specs. I built a coil awhile ago and when I put it on the ohm meter it was .35 ohms so I was like darn... Can't use it. At the moment I have a Efest IMR 18500 3.7v 1100mah to use until my bad boy battery comes in. So here's the break down!

So given the battery is a 3.7v but at full charge would be 4.2v that's the number I plugged in. So that makes 12A of power-a-flowin' but my battery is only rated for 8.8A.... So I mean it doesn't take a genius to see the 3.2A difference.. That being said what's the dangers of having more sucking than blowing? ( ) but really.. What's the risk? what's the danger? What's the possibility of thermal runaway?(and what is thermal runaway).... Basically, anything you want to tell me about this I'll be appreciative and I'm willing to learn more! Thanks in advance y'all !

3.7volts/8.8amps = 0.42 ohms

That battery probably has an internal resistance of 0.42 ohms
That's higher than your 0.35 ohm coil.

When you put the coil on load, more heat will go into heating up the battery than to heating up your coil.
You battery is going to get Hot.

 

[GreMos90]

3.7volts/8.8amps = 0.42 ohms

That battery probably has an internal resistance of 0.42 ohms
That's higher than your 0.35 ohm coil.

When you put the coil on load, more heat will go into heating up the battery than to heating up your coil.
You battery is going to get Hot.

That's intense ! I didn't know it worked like that!

And for the third time I'm not using it haha

 

[anumber1]

So long as I don't get a short in my coils, over drain the battery or vape until it get's super hot. There's no guarantee though, I could be vaping tonight and the thing suddenly get's too hot for me to hold. At that point I will throw it as far from me and anything flammable as I can. "Sub-ohming" with a mechanical does not come without it's risks but how I love to blow nice fluffy clouds! As long as you're using a good battery and carefully make your coils you'll be ok!

That^^^^^^^

The risks are there but manageable if there is real understanding of them. The risks are quite high if you dont have that understanding.

 

[ClintS]

Lithium when heated will start to release a gas, if the gas has no place to escape or is slowly released building pressure the container may eventually explode. If lithium continues to heat a fire starts that can be very hard to extinguish until all of fuel is used up. The best means for prevention is not to raise the temperature of lithium to where it starts to vent releasing gasses.

 

[anumber1]

I don't plan on using it all I have many atomizers just rotating safely haha. Be another week before me 35A efests come in.

I hate to say it but those efest 35 amp batts are kind of not what they seem. There is a thread here somewhere showing testing that reveals they are closer to 20 amp batteries.

The Sony VTC batteries are a safer bet. AW batteries are extensivly tested prior to branding. Those are the best on the market regarding whether or not they meet their published spec.

 

[GreMos90]

I hate to say it but those efest 35 amp batts are kind of not what they seem. There is a thread here somewhere showing testing that reveals they are closer to 20 amp batteries.

The Sony VTC batteries are a safer bet. AW batteries are extensivly tested prior to branding. Those are the best on the market regarding whether or not they meet their published spec.

Really?... I'll look up the thread I suppose but I every time I see cloud chasing videos it's usually these I see that they're using.

EDIT:

Also aren't the VTC's hybrids? Which are a here and there from Lithion Ion and Li-Mn which means there safer than regular Li-ion but not as reliable than Li-Mn or IMR.?

 

[Baditude]

I've read the same independent test results of the purple Efest 30/35 amp batteries. In my extensive battery research, I've found that Efest often overstates their battery specifications. Not a fan of Efest batteries. My .

As we should all know by now, ICR batteries can vent flames and explode when they go into thermal runaway. IMHO they should be not be used in personal vaporizors/mods. It's no longer worth the risk with the safer chemistry IMR and IMR/hybrid batteries now available. I have myself had a protected ICR battery explode with flames in a mechanical mod (second pic below).



Although IMR and IMR/hybrid batteries are safer to use, respect the power that they contain. Any battery when hard shorted can go into thermal runaway, including IMR. Below are pics of AW IMR batteries which went into thermal runaway.



Imagine the first battery above venting in a mechanical mod. It has vented it's internal contents like an accordian. The swelling during the venting process could theoretically block the vent holes in a mechanical mod, literally making a pipe bomb out of the mod with the hot gas having nowhere to go but bust out of the mod. This AW IMR battery happened to vent outside of a mod. In the second pic, the venting gas of an AW IMR was hot enough to melt the case the mod was being stored in, causing a pretty decent fire.

 

[GreMos90]

I've read the same independent test results of the purple Efest 30/35 amp batteries. In my extensive battery research, I've found that Efest often overstates their battery specifications. Not a fan of Efest batteries. My .

As we should all know by now, ICR batteries can vent flames and explode when they go into thermal runaway. IMHO they should be not be used in personal vaporizors/mods. It's no longer worth the risk with the safer chemistry IMR and IMR/hybrid batteries now available. I have myself had a protected ICR battery explode with flames in a mechanical mod (second pic below).

View attachment 330535View attachment 330537

Although IMR and IMR/hybrid batteries are safer to use, respect the power that they contain. Any battery when hard shorted can go into thermal runaway, including IMR. Below are pics of AW IMR batteries which went into thermal runaway.

View attachment 330539View attachment 330540

Imagine the first battery above venting in a mechanical mod. It has vented it's internal contents like an accordian. The swelling during the venting process could theoretically block the vent holes in a mechanical mod, literally making a pipe bomb out of the mod. This battery happened to vent outside of a mod. In the second pic, the venting gas was hot enough to melt the case the mod was being stored in, causing a pretty decent fire.

Wow that's some freaky stuff. So it can just happen at any point in time? Not just from holding the button too long or using it past it's safe point?

 

[jwag1973]

Get some Sony VTC4's or 5's.They are proven performers!

 

[Baditude]

Wow that's some freaky stuff. So it can just happen at any point in time? Not just from holding the button too long or using it past it's safe point?

Extremely rare, but yes it can happen. Not so rare if it happens to occur to you.

The first IMR battery was being transported without a plastic battery case in a book bag. It apparently came into contact with a metalic object (keys, coins, metal zipper, etc) to complete the battery circuit, causing the battery to overdischarge and go into thermal runaway. I'm not aware of the circumstances of the second IMR battery, but by the pictures it was being stored in the mod case.