Coils / Batterys ... more info...please

[Breathing Better]

I'm going to step up to a mech mod soon and have read everything online about building different type coils and evaluations about batteries. Every article has these "DANGER- DANGER " warnings about matching your battery to the resistance of the coil. But that's where it stops . No charts, formulas, etc. on how to decide what this relationship should be. Why can't there be a chart that says " OK, we have a 1 ohm coil use a XXX battery with it. It's just all scare and no explanation of what to do. Please help!!!
And why do some loops touch each other and some have a space?

 

[Wraith504]

I'm going to step up to a mech mod soon and have read everything online about building different type coils and evaluations about batteries. Every article has these "DANGER- DANGER " warnings about matching your battery to the resistance of the coil. But that's where it stops . No charts, formulas, etc. on how to decide what this relationship should be. Why can't there be a chart that says " OK, we have a 1 ohm coil use a XXX battery with it. It's just all scare and no explanation of what to do. Please help!!!

You are not matching a battery to the resistance of a coil. You are building coils at a resistance which will draw a safe amount of amps in relation to a batteries amp rating. So if you have a 30 amp battery and you draw 40 amps that = bad/unsafe. But if you have a 30 amp battery and you draw 18amps then that is ok.

 

[cobalt327]

I would suggest you take a look at the forums in the E-Cigarette Technical section. Good luck!

 

[Spencer87]

If you Simply google battery safety chart.... there are charts.

Plus, if you look around here you can find them.
This thread comes up pretty much 3 times a week.


https://www.google.co.jp/search?q=b...dor-list-pre-punched-cartomizers.html;800;495

E-Cigarette Forum - Baditude - Blogs

those two links ... all you need to know
happy vaping.

P.s Get a copper mod!!

 

[ROM CGY]

There are a number of good charts on the net. There is a good ohms/voltage/amp calculator here:
http://www.the12volt.com/ohm/ohmslawcalculators.asp

Basically you want to have a good ballpark of what the amp draw of your build is expected to be and match this against the amp limit of your battery. If you create a build that exceeds the amp limit of your battery you risk anything from damaging your batter and/or gear to the battery venting gas and exploding.

 

[javyn]

Just make sure that 1) your build doesn't have a short (use an ohm checker) and 2) that your build's current does not exceed what your battery is capable of. I use this calculator as a go by...

Voltage current resistance and electric power general basic electrical formulas mathematical calculations calculator formula for power calculating energy work equation power law watts understandimg general electrical pie chart electricity calculation

For example, putting in a fresh 4.2V battery on a coil that's .5 ohm is going to draw 8.4 amps from your battery, so make sure your battery's max current is above that.

 

[SeaNap]

Volts = Amps x Ohms

While you are just starting out I would recommend staying above .75ohms for the time being, once you get familiar with building AND testing your coils and when you fully understand what current limit each part of your mod and batt can handle then you can safely venture lower.

My recommended batts are Sony VTC5 (30A), Samsung 25R (20A), LG HE2 (20A), and AW IMR 1600 (24A)


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[Breathing Better]

OK ..Found a chart that says R= E squared /P
Example : 3.7 volts ( listed on the battery) @ 30 watts (listed on the battery) creates .45633 ohms. So as long as I make a coil .45633 ohms or higher I should be OK.
Is that right?
One explanation I read used continuous amps. in his formula, but I've never seen anything but milliamps on a battery.
And what about protected and unprotected. Some say one, some say the other.

 

[Wraith504]

Steam Engine | free vaping calculators
This may help as well.
In a mech you need to use IMR unprotected batteries ONLY!

 

[pyang]

Edit: wrong thread.

 

[Wraith504]

I'm assuming you're looking to blow big clouds. I, for one, think it's ridiculously pointless, but if its your thing go for it. Just make sure you play safe. I suggest getting high amp batteries ie. Sony vtc4/5.

I dont really see how you can make that assumption based on the OP

 

[edyle]

I'm going to step up to a mech mod soon and have read everything online about building different type coils and evaluations about batteries. Every article has these "DANGER- DANGER " warnings about matching your battery to the resistance of the coil. But that's where it stops . No charts, formulas, etc. on how to decide what this relationship should be. Why can't there be a chart that says " OK, we have a 1 ohm coil use a XXX battery with it. It's just all scare and no explanation of what to do. Please help!!!
And why do some loops touch each other and some have a space?

First of all, going to a mech does not mean stepping up.

It would help if you stated what you are currently using, and for how long.

If you are stepping up to rebuildables then there is no need to complicate it by also using a mech at the same time.

Battery labelling usually just states the maH energy capacity; they don't usually state the continuous amp rating.

 

[pyang]

I dont really see how you can make that assumption based on the OP

Oops it was meant for another thread. Sorry.

 

[dice57]

well, the explanation is all there, is up to the vaper to find it. Check the sub forums, it's all spelled out in amps and watts, volts and ohms. A general understanding of ohm's law is needed, once understanding how many amps are demanded of the battery when a build of x.yz ohms is used. Knowing that will answer all your questions.

 

[joesquid]

First I wanna say welcome to ECF! Sounds to me like you need to do alot more reading until you understand Battery safety and ohms law. Have you read Baditudes blogs? To be quite honest, I don't think you're ready for a mech. Why do you want one? There are many high powered regulated mods out now that provide you some protection.

 

[KenD]

OK ..Found a chart that says R= E squared /P
Example : 3.7 volts ( listed on the battery) @ 30 watts (listed on the battery) creates .45633 ohms. So as long as I make a coil .45633 ohms or higher I should be OK.
Is that right?
One explanation I read used continuous amps. in his formula, but I've never seen anything but milliamps on a battery.
And what about protected and unprotected. Some say one, some say the other.

A fully charged battery is 4.2 volts (except a small number of batteries that are higher rated, from 4.25 to 4.35). Use 4.2 when calculating the current draw. Watts is a result of the resistance of the coil and the charge of the battery, not an inherent quality of the battery.

Use an ohms law calculator (several have been linked here, or you can simply google "ohms law calculator"), input your voltage (4.2) and your resistance and you'll see how many amps you'll draw. Make sure your battery can handle that draw. Amp ratings of popular batteries can be found on Baditude's blogs here at ecf. For example, the Sony vtc4 and 5 can handle 30 amps (a 0.14 ohm coil, don't go that low), the LG he2 can handle 20 amps (a 0.21 ohm coil, don't go that low). Note that the purple 2500 mAh Efest is marketed as a 35 amp battery but it's actually 20 amps.

 

[SeaNap]

OK ..Found a chart that says R= E squared /P
Example : 3.7 volts ( listed on the battery) @ 30 watts (listed on the battery) creates .45633 ohms. So as long as I make a coil .45633 ohms or higher I should be OK.
Is that right?
One explanation I read used continuous amps. in his formula, but I've never seen anything but milliamps on a battery.
And what about protected and unprotected. Some say one, some say the other.

That is not right. Do you have a way to measure voltage and resistance? Use your volt meter to measure your batt, a freshly charged batt is 4.2. That is what you use to calculate your amp draw.

Watts = Volts x Amps
To be honest knowing the watts of your build is rather useless information in a mech. What you care about is Amps. The marking on a battery may give a Watt-Hour rating but again this is rather useless to you. You need to do your research and find the "Max Continuous Discharge rating" of your batt. This info will not be printed on the batt itself, you just need to google the battery part number. What you are seeing on the batt is mAh which is milliAmp hours. This is just a measure of capacity not discharge.

Regulated mods (vv/vw) have a maximum amp and watt limit of the circuit board that you need to be mindful of, but a true mechanical has no limit EXCEPT for what component is rated for. For example there are some mechs out there that use a 5A firing switch, that would mean the lowest you can build would be 4.2V/5A = 0.84ohm.

You need to find the lowest amp rating of your mod, it may be the batt, it may be the switch, it may be the spring or fuse protection. Then you use that amp limit to calculate resistance. You know the batt voltage is 4.2 and you know the amp limit (let's use 10A) then you plug those numbers into the formula V = I x R

4.2V = 10A x Xohms

Solve for ohms then you must not build a coil lower than the ohms you calculated.

In a mech you need unprotected batts preferably IMR chemistry. Get some. VTC5, VTC4 , HE2, 25R, or AW IMR 1600.



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[Breathing Better]

Where do you find the continuous amp rating?

 

[Breathing Better]

Battery name and mah Continuous Discharge Amps Maximum Discharge Amps C Rating Safe Ohm to run

AW IMR
AW 14500 600 mah 4.8 amp 6 amp 8c 0.9 ohm
AW 16340 550 mah 4.4 amps 5.5 amp 8c 1 ohm
AW 18350 700 mah 6.4 amp 7 amp 8c 0.7 ohm
AW 18490 1100 mah 8.8 amp 11 amp 8c 0.5 ohm
AW 18650 1600 mah 16 amp 24 amp 15c 0.3 ohm
AW 18650 2000 mah 7.5 amp 10 amp 5c 0.5 ohm

Efest IMR
Efest 10440 350 mah 1.4 amp 3 amp 8c 3 ohm
Efest 14500 700 mah 5.6 amp 7 amp 8c 0.8 ohm
Efest 16340 700 mah 5.6 amp 7 amp 8c 0.8 ohm
Efest 18350 800 mah 6.4 amp 8 amp 8c 0.7 ohm
Efest 18490 1100 mah 8.8 amp 11 amp 8c 0.5 ohm
Efest 18650 1600 mah 20 amp 30 amp 18.75c 0.3 ohm
Efest 18650 2000 mah 15 amp 20 amp 8c 0.4 ohm
Efest 18650 2250 mah 18 amp 20 amp 8c 0.5 ohm
Efest 26500 3000 mah 20 amp 30 amp 6.5c 0.5 ohm
Efest 26650 3000 mah 20 amp 30 amp 6.5c 0.5 ohm

EH IMR
EH 14500 600 mah 4.8 amp 6 amp 8c 0.9 ohm
EH 15270 400 mah 3.2 amp 4 amp 8c 1.4 ohm
EH 18350 800 mah 6.4 amp 8 amp 8c 0.7 ohm
EH 18500 1100 mah 8.8 amp 11 amp 8c 0.5 ohm
EH 18650 2000 mah 16 amp 20 amp 8c 0.4 ohm
EH 18650 NP 1600 mah 20 amp 30 amp 18.75 c 0.3 ohm

MNKE IMR
MNKE 18650 20 amp 30 amp 18.75c 0.3 ohm
MNKE 26650 20 amp 30 amp 18.75c 0.3 ohm

Samsung ICR INR
Samsung ICR18650-22P 2200 mah 5 amp 10 amp 4.5c 0.9 ohm
Samsung ICR18650- 30A 3000 mah 2.4 amp 5.9 amp 1c 1.5 ohm
Samsung INR18650-20R 2000 mah 7.5 amp 15 amp 7c 0.6 ohm

Sony
Sony US18650v3 2150 mah 5 amp 10 amp 4.5c 0.9 ohm
Sony US18650VTC3 1600 mah 15 amp 30 amp 9.5c 0.4 ohm

Trustfire IMR
Trustfire 14500 700 mah 2 amp 4 amp 2c 2.2 ohm
Trustfire 16340 700 mah 2 amp 4 amp 2c 2.2 ohm
Trustfire 18350 800 mah 4 amp 6.4 amp 5c 1.1 ohm
Trustfire 18500 1300 maah 6.5 amp 8.5 amp 5c 0.7 ohm
Trustfire 18650 1500 mah 7.5 amp 10 amp 5c 0.6 ohm

Panasonic
NCR18650B 18650 3 amp 4 amp 1.1c 1.5 ohm
NCR18650PF 18650 5 amp 10 amp 3.4c 0.9 ohm
NCR18650PD 18650 5 amp 10 amp 3.4 c 0.9 ohm
NCR18650 18650 2.7 amps 5.5 amps .5 c 1.6 ohm
any other protected 18650 3 amp 4 amp 1.5ohm
any unprotected 18650 5 amp 10 amp 0.9 ohm

Orbtronic
sx22 18650 22 amp 29 amp 11 c 0.2 ohm

This is the chart I have been looking for. No formulas, no research, no worries. Just facts. Thanks for your help

 

[CircaSurvives]

You are not matching a battery to the resistance of a coil. You are building coils at a resistance which will draw a safe amount of amps in relation to a batteries amp rating. So if you have a 30 amp battery and you draw 40 amps that = bad/unsafe. But if you have a 30 amp battery and you draw 18amps then that is ok.

Couldn't have said it better.