Dangerous ohms? Coil builds.

[Inception]

Is there such thing as a "dangerous" coil? I heard of some people warning me about going below .6ohms coil builds. I currently have a cronus mech mod with a MNKE IMR-18650 battery and the current coil build is .4ohms 22g 7wraps single macro style. The rda was a very simple no name generic rda that I drilled out the air holes. Is this a bad idea? I use it with caution and tried doing research but had no luck. One mentioned battery damage. Buuuut I went for the fourms for some advice.

~I

 

[InTheShade]

Good for you for checking.

Assuming it's a genuine battery, that battery is 20amp continuous.

Staying above .6ohms is reasonable I suppose, but it's all about the amp draw of your build. Just use a simple ohms law vaping calculator and type in the information of your battery and resistance of your build and it will tell you the amp draw. Keep this below 20 (plus a 'safety factor of say 15-20%) and you'll minimize the risk of having a battery event.

At 0.4 with a fresh battery you are pulling about 10.5 amps from that battery. So assuming the battery is performing to spec, your risk is low.

 

[1mouse3]

I know a vtc4/5 is good down that low but not sure on that battery, I had a vamped battery go a silent death running my build at .3-.4

 

[Inception]

What is a silent desathe? When it's going fine then just cuts out?

 

[Train2]

The danger in low ohms is overstressing a battery. You want to learn about the limits, so you buy batteries that can handle the kind of vaping you're doing. Sounds like you are OK now - but if you want to go lower, definitely study a little (there's actually a great website called Battery University, LOL).

DO check your resistance before firing a new build, and check for an online ohm's law calculator, so you can see what kind of amps your build will pull...

 

[1mouse3]

it lost all voltage an would no longer take a charge, they will also go violently an explode or catch fire. here is good calculator to use

Battery mAh & C Rating = amp Calculator

 

[Inception]

Oh wow. Thank you so much.

 

[Inception]

And yes I am in the green for this coil. Thanks once again

 

[Inception]

It says I get 8mins of runtime XD

 

[edwinoey]

dangerous coil build depends on the battery amp limit. for example 20 amps the limit is 0.25 and 30 amps is 0.1x CMIIW hope it helps

 

[Cullin Kin]

it lost all voltage an would no longer take a charge, they will also go violently an explode or catch fire. here is good calculator to use

Battery mAh & C Rating = amp Calculator

Those vamped batteries are bad news... I was in Cali this weekend and I went to a vape shop there and they only carried those Vamped batteries... They were building at 0.12Ω. Needless to say, they didn't get my business.

It seems everywhere I go, the people working at the vape shops have literally no idea what they are doing. WHY?!?!?!?!?!?!

OP, good for you for creating this thread. I love seeing newcomers actually willing to learn.

 

[InTheShade]

dangerous coil build depends on the battery amp limit. for example 20 amps the limit is 0.25 and 30 amps is 0.1x CMIIW hope it helps

That 'x' is pretty important. At 4.2V, an ohms law calculator says it's 0.14ohms draws 30amps - but that is assuming your battery is performing at spec and that your resistance checker is perfectly calibrated.

If your resistance checker is even 0.05 off, on a fresh battery you are at almost 47 amps - and that has the potential of not ending well.

Pushing the limits means increasing the probability that something can go wrong.

 

[edyle]

Is there such thing as a "dangerous" coil? I heard of some people warning me about going below .6ohms coil builds. I currently have a cronus mech mod with a MNKE IMR-18650 battery and the current coil build is .4ohms 22g 7wraps single macro style. The rda was a very simple no name generic rda that I drilled out the air holes. Is this a bad idea? I use it with caution and tried doing research but had no luck. One mentioned battery damage. Buuuut I went for the fourms for some advice.

~I

Shorting out your electrical power is a dangerous thing to do.

What is a short? That's when you connect the power to just about no ohms.

How much is 'just about no ohms' ?

Well that's when the question mark comes.
As a ballpark measure, anytime you get below 1 ohm (arbitrary number, but easy to remember) things go south faster and faster.

So basically, once you're above 1 ohm, you're in a regular zone.

If you go below 1 ohm, you're accross the border to be on alert watch the numbers.

 

[edyle]

Is there such thing as a "dangerous" coil? I heard of some people warning me about going below .6ohms coil builds. I currently have a cronus mech mod with a MNKE IMR-18650 battery and the current coil build is .4ohms 22g 7wraps single macro style. The rda was a very simple no name generic rda that I drilled out the air holes. Is this a bad idea? I use it with caution and tried doing research but had no luck. One mentioned battery damage. Buuuut I went for the fourms for some advice.

~I

22 gauge is pretty thick wire; 28 gauge is the normal gauge on rebuildables; 30 gauge is the all round gauge used on both rebuildables and prefab factory made coils.

The thicker the wire, the longer it's going to last, and easier to handle with your fingers, therefore the inclination is to use thicker wire; however thicker wire ends up with lower resistance; plus lower resistance draws more power, and the thicker wire can handle more power, so the inclination is to fall down the rabbit hole.

Don't fall down the rabbit hole.


And you use a mech mod; great way to save money, but a regulated mod tells you what you're doing, and gives you some controls over it, whereas a mech mod is fine when you already know what you're doing.

 

[Susan~S]

I highly recommend you spend some time with Baditude (one of our resident battery experts) and visit his blogs. You are now 100% in control of your own safety (and others around you). Make sure you purchase an ohm reader and a voltmeter or DMM so you can measure your builds, check for shorts and measure the remaining charge on your batteries.

Baditudes Blogs. The blogs regarding mods and rebuildables are listed below:

BATTERIES

9. Battery Basics for Mods: IMR or Protected ICR?
* Another essential read to understand which batteries are safe to use in mechanical and regulated mods. Includes a frequently updated list of recommended safe-chemistry, high-drain batteries with their specifications.

17. Purple Efest Batteries Not As Advertised
* A cautionary blog that reveals that the purple Efest batteries may not have the specifications advertised. Also includes a commentary on "continuous discharge ratings" vs "pulse discharge ratings" of battery specs.

OHM'S LAW

14. Ohm's Law for Dummies (Vapers)
* My attempt at explaining Ohm's Law in layman terms and how it relates to vaping.

16. Explain it to the Dumb Noob: Ohm's Law Calculations
* As simple as it is to use, some people have a tough time grasping the concept. Warning: Includes graphic photos of mod explosions.

MECHANICAL MODS & REBUILDABLES

7. Information Resources for Your First RBA
* An essential read and reference guide for someone new to rebuilding coils. Includes a multitude of useful links on battery safety, mod safety, coil meters, coil building, and the differences in the three types of RBA's.

15. Inexpensive Mechanical Mod and RDA Setup
* A response to the frequently asked question on how to get into rebuildable atomizers with a mechanical mod inexpensively. Includes a list of commonly used tools and supplies for rebuilding and where to find them.

BATTERIES - WHERE TO BUY

Only buy batteries from a reputable supplier (not ebay or Amazon) as there are many counterfeit batteries being sold. Here are several reputable battery suppliers in the US.

* RTD Vapor
* Illumination Supply
* Lighthound
* Orbtronics

 

[tj99959]

The bottom line is that you control your own destiny with the setup you have. So never go beyond what you feel comfortable doing.
If I have to wonder if some particular build will be safe, I probably shouldn't be using it.
My personal limit is that I never exceed 50% of a batteries continues amp rating. Which works out to a 0.42 ohm coil on a 20 amp battery.
My logic is that a battery is only new one time, so is that one year old battery still a 20 amp battery.
I have never seen a chart for batteries that have been recharged 300-400 times.