short cirquit

[Punk In Drublic]

I think he certainly stressed out his old battery and its knackered now, but the new one is playing for him, very bad, you are lucky it did not blow up,check out ohms law and the cdr rating for the battery you are using

Possible. But if that was the case you would think he would receive a low battery error and not an atomizer short. Unless we are not getting the full details of the problem. Or, as mentioned above, the device’s error has more than one meaning.

Understanding Ohms law with a regulated device is important. But Ohms law with a regulated device differs from a mechanical. It is not Current = Battery Voltage/Coil Resistance, it is Current = Power (in watts)/Battery Voltage. We could throw device efficiency in there as well but that’s the gist of it. Coil resistance does not apply to the battery current draw with a regulated device.

Many formula’s within Ohm’s Law, knowing which one applies to your application is key.

@jefl – it is important to operate your device within your batteries capabilities. Exceeding these capabilities will reduce the life of your batteries and could result in the batteries venting, or even worse a thermal runaway.

 

[Marper]

And thermal runaway is not for the faint hearted, remember, these batteries we use are rated at 15 amps going up to 40 and more with the new battery configurations coming out, this is not a simple aa battery and will kill you if you don't respect it, these batteries have the potential to actually weld although for a small time,.75 ohm on a dual build single batt mod is pushing it to the core, please read up on safety and why

 

[somdcomputerguy]

.15 / 2 = .075

Calculating battery current draw for a regulated mod | E-Cigarette Forum

Regulated Mod Amp Draw Calculator

Battery Amp Draw / Drain Calculator - Vaping Hardware

Battery drain | Steam Engine | free vaping calculators

A guide on calculating amp load using a regulated mod.

 

[Punk In Drublic]

And thermal runaway is not for the faint hearted, remember, these batteries we use are rated at 15 amps going up to 40 and more with the new battery configurations coming out, this is not a simple aa battery and will kill you if you don't respect it, these batteries have the potential to actually weld although for a small time,.75 ohm on a dual build single batt mod is pushing it to the core, please read up on safety and why

Going to assume 0.75 ohms was a typo – that’s not high but not super low either.

But I do not see super low resistance as being a risk with regulated devices. The circuit dictates how low you can go. Exceed this limit, your device just does not fire. The users power setting is what determines the risk. And resistance does not dictate power.

I’m currently using a 0.11 ohm coil. On a mech with a 4.2 volt battery this would exceed all of Mooch’s recommended batteries with a ~38 amp draw. But I am operating this coil at 50 watts, which on a single cell device is drawing approx. 18 amps max

 

[classwife]

Merged 3 threads.
Please, do not cross post

 

[BrotherBob]

.1, but i think i found the solution.
i changed my battery and now it seems to be working

Welcome and glad you joined. Nice to hear you solved your problem.

 

[Coyote628]

Going to assume 0.75 ohms was a typo – that’s not high but not super low either.

But I do not see super low resistance as being a risk with regulated devices. The circuit dictates how low you can go. Exceed this limit, your device just does not fire. The users power setting is what determines the risk. And resistance does not dictate power.

I’m currently using a 0.11 ohm coil. On a mech with a 4.2 volt battery this would exceed all of Mooch’s recommended batteries with a ~38 amp draw. But I am operating this coil at 50 watts, which on a single cell device is drawing approx. 18 amps max

.75 has to be a typo. .15ohms divided by 2 is .075ohms. And that will take a battery in the danger zone pretty quick. And I'm curious about a single coil showing .15ohms. Maybe because none I've ever made got that low with one coil. Is it possible?

 

[Marper]

Yeah it was a typo, sorry

 

[Coyote628]

Yeah it was a typo, sorry

It happens. No worries. I'm still puzzling over a single .15ohm coil. I suppose its possible, technically, but even the low resistance clapton wire I've used I could only get that kind of numbers with a dual coil setup. The OP's short circuit issue is a mystery indeed, and not easily diagnosed with the little info provided. And then suddenly solved with a fresh battery?

 

[Marper]

It happens. No worries. I'm still puzzling over a single .15ohm coil. I suppose its possible, technically, but even the low resistance clapton wire I've used I could only get that kind of numbers with a dual coil setup. The OP's short circuit issue is a mystery indeed, and not easily diagnosed with the little info provided. And then suddenly solved with a fresh battery?

I agree it's a mystery, a single at .15 ,I've never heard of it before

 

[Punk In Drublic]

And that will take a battery in the danger zone pretty quick. And I'm curious about a single coil showing .15ohms. Maybe because none I've ever made got that low with one coil. Is it possible?

On a mechanical device I would agree. On a regulated device the coil resistance does not determine the current draw on the batteries. The users power setting does, which in this case has yet to be determined.

0.15 ohms per coil is pretty low, but obtainable. Was given a pair of coils by a local shop, they were some sort of twisted frame staple monstrosity. Was told they were 0.2 ohms each. Measured with a multimeter they came out to roughly 0.17 ohms each. Cutting approx. 5mm off the legs resulted in roughly 0.15 ohms.

 

[mcclintock]

When the coils are new, if they're contact coils you need to dry burn them and work out the shorts, if present, which will show as partial heating. Heat them (or one at a time) some and then stroke across the coils with am object to move them slightly between burns so connection between the wraps is broken long enough for oxide insulation to fully form on the wire.

 

[Zaryk]

I agree it's a mystery, a single at .15 ,I've never heard of it before

I build singles that ohm out down to .11 occasionally. Usually stay in the .15-.18 range for the most part though.

 

[stols001]

Um could it be your coils are getting older and perhaps dropping in resistance? You are at a LOW resistance with two 0.15 coils. This may be why it's happening,.

It's just a thought, but coils do change over time with use.

Personally I would go a bit higher with your next two coils resistance you are kind of pushing an envelope in a lot of ways that may just need to be SEALED and discarded,

Just my 2 cents, take it for what it is worth.
Anna