Is my battery safe to use for squonk

[Darkkon]

Hi,

I have never use mechanical mods before. I would like to know if Sony VTC6 with dual coil 0.5 for dotmod Squonk safe?

Please kindly advice.

Thank you.

 

[Baditude]

If you are going to use a mech mod and sub-ohm coils, you need to know how to use an Ohm's Law calculator. You need to be able to find the "amp draw" of the coils you will be using. You never want to ever exceed the amp rating of your battery.

Explain it to the Dumb Noob: Ohm's Law Calculations for a Mechanical Mod

• As simple as it is to use, some people have a tough time grasping the concept. Recently revised to make it even simpler to understand.

You need to use a measuring device to measure the resistance of the coils. Never trust a manufacturer's advertised measurement or a coil wrapping calculator. Always check the resistance before using. Something like a box ohm reader or a regulated mod will work.

Is the o.5 ohm measurement for each individual coil or both coils measured together? (EDIT)

The Sony VTC6 has a continuous discharge rate of 15 amps.

So, plug in the known numbers into the calculator and let it do the math for you.

Ohms Law Calculator​

1. In the "voltage" window type in 4.2, the voltage of a fully charged battery.
2. In the "resistance" window type in your build's measured overall resistance.
3. Press "calculate".

If your coils' overall resistance is 0.25 ohm, the "amp draw" (current window) will be 16.8 amps. That is over the 15 amps of the Sony VTC6. Either use a higher amp battery or a higher ohm build.

If your coils' overall resistance is 0.5 ohm, the amp draw will be 8.4 amps, which is well below the 15 amps of that battery. You're good to go with that build and battery.
​

I don't know of an easier way to explain this. Should you have any questions, please ask.

(original post edited)

 

[Spey]

Is the o.5 ohm measurement for one or both coils? Using a dual coil build, the overall resistance is halved.

• For example, if each individual coil measures 0.5 ohm, using two together (0.5 ohm x 2 = 1.2 ohm) will have an overall resistance of 0.5 ohms.
• If each individual coil measures 0.25 ohm, using two together (0.25 x 2 = 0.5 ohm) will have an overall resistance of 0.25 ohm.

I think the use of symbols and the math may be a bit off there.

If running two same coils in parallel; the measured resistance for one coil is haved for the pair.
Example: (2) 0.5ohm coils / 2 = 0.25ohms for the pair.

If on the other-hand same coils are run in series; the measured resistance for one coil is doubled for the pair.
Example: (2) 0.5ohm coils x 2 = 1.0ohms for the pair.

Darkkon,
You really have not provided enough information to answer your question. Additionally, the type of wire and guage will additionally affect both is it safe, and will it be effective/enjoyable.

As mentioned above, highly recommended that you become comfortable in understanding how to use a coil building calculator BEFORE you delve into using a mech.

Regards,

 

[Baditude]

I think the use of symbols and the math may be a bit off there.

If running two same coils in parallel; the measured resistance for one coil is haved for the pair.
Example: (2) 0.5ohm coils / 2 = 0.25ohms for the pair.

If on the other-hand same coils are run in series; the measured resistance for one coil is doubled for the pair.
Example: (2) 0.5ohm coils x 2 = 1.0ohms for the pair.

I guess I maybe somehow confused myself between single coil and dual coil builds. Sorry about that folks.

Target resistance for a 0.6 ohm simple single coil build would require 5 full wraps of 26G kanthal round wire around a 2.5mm post.

Target resistance for a 0.6 ohm simple dual coil build would require making two identical 1.2 ohm coils consisting of 10 full wraps, 26G round kanthal wire around a 2.5mm post for an overall atomizer resistance of 0.6 ohm. This is where resistance gets "halved".

Better? (Edited original post)

 

[Spey]

I guess I should have been more specific, but I didn't wish to make it sound more complicated by explaining the difference between parallel and series builds.

My assumption was a beginner would be using two simple coils in parallel for a dual coil build. I guess one should never assume anything.

Baditude,

You completely missed focus regarding why I even posted into this thread.

Re-read my post paying attention to what you wrote after each asterisk.

Forget anything related to parrallel vs. series and focus on the simple caclulation methodology and math symbols you used and the outcome. I am guessing simple typing errors, lack of review b4 posting, etc ...

I am not meaning to be in anyone's face, just attempting corrective commentary ;-)

Regards,

 

[bwh79]

• For example, if each individual coil measures 0.5 ohm, using two together (0.5 ohm x 2 = 1.2 ohm) will have an overall resistance of 0.5 ohms.

• If each individual coil measures 0.25 ohm, using two together (0.25 x 2 = 0.5 ohm) will have an overall resistance of 0.25 ohm.

Say what, now?

I have never use mechanical mods before. I would like to know if Sony VTC6 with dual coil 0.5 for dotmod Squonk safe?

Always measure your atomizer, fully assembled, on a regulated device or stand-alone ohm reader before firing on a mech mod. The Sony VTC6 is a 15-amp rated cell. At .5 ohm the amp draw is 8.4A (assuming full charge of 4.2v, for safety), at .25 ohm it's 16.8A which is over the CDR (continuous discharge rate, the aforementioned 15A limit) of that battery.

 

[Darkkon]

Hi All,

Thank you for advises. Appreciate them. Really!.
Why am I using a Sony VTC 6 is because my current regulated mod (Dotmod 75W) is using it. I was thinking, if it would be a good fit for Dotmod Squonk so I could buy 1 less battery.

A year ago and now, whenever I search Sony VTC 6 specs. It shows Max Continuous Discharge Current at 20A. So shouldn't the VTC 6 be a 20-amp rated cell?

So based on my findings about VTC 6 specs. Shouldn't the battery able to support the 16.8 Amps?

Anyway I guess is my fault for not providing more info.
I have decided to get 0.5 ohms coil (0.25 ohms for dual coils).
I entered Ohms at 0.25 with Volts at 4.2 (Full Charge Volt) and I got 16.8 Amps and 70.56 Watts.
Also, I don't understand one point. Why in calculator under voltage, I should put Full charge Voltage but not Norminal voltage +/- 1 of 3.6V/3.7V?

Please kindly advise.

Thank you.

 

[sonicbomb]

Mooch tested the VTC6 in February and gave it a rating of 15 amps, or 20 amps dependent on temperature. Read the test results and make your own decision.
Bench Retest Results: Sony VTC6 15A 3000mAh 18650…a fantastic 15A/20A battery!

4.2 volts is the maximum charge therefore the maximum output and amp draw, as with all unregulated devices this value decreases as you use it.
The nominal 3.7 volts value represents an average voltage that the cell will spend the majority of it's time during the discharge cycle.

 

[Baditude]

A year ago and now, whenever I search Sony VTC 6 specs. It shows Max Continuous Discharge Current at 20A. So shouldn't the VTC 6 be a 20-amp rated cell?

So based on my findings about VTC 6 specs. Shouldn't the battery able to support the 16.8 Amps?

"Sony gives this cell a continuous current rating of 15A but allows for temperature-limited operation at a level above that. You can run it at above 15A but only until you reach a certain temperature, 80°C, and then the discharge must stop.​

"But this is not a high performance “power” cell, designed for high current. It is a high capacity “energy” cell designed for low to moderate power levels and long running time. At higher current levels the voltage sag and power loss in the cell are huge. Do not exceed 20A.​

"I am giving this cell a continuous current rating of 15A (about 45W using 3.7V) and a temperature-limited rating of 20A (about 60W if using 3.7V) as long as the cell is never allowed to reach 80°C." -- Battery Mooch​

Like Sonic said, read Mooch's analysis of this cell and decide for yourself if this is the best cell for your application.

I personally put more faith into Mooch's honest scientific analysis than I do any vendor's market-driven advertisement and specifications. A vendor can and will list whatever battery specs that will help him sell more batteries. We see this all the time with the battery rewrap brands who routinely grossly exaggerate their amp ratings. At least Mooch bench tests a battery's performance and then provides an honest analysis from a real world performance and safety perspective.

The Sony VTC6 and Samsung 30Q could probably support 16.8 amps for a short time, but you will likely compromise the 3000 mAh capacity and prematurely age the cell by pushing it so hard. Probably a better idea to use a real 20 amp battery IMHO.

 

[Darkkon]

Noted with thanks and I will listen to you pro’s advise and get a 20 amp battery instead. Anybody have a good 20 amp 18650 battery to recommend?

 

[Baditude]

Anybody have a good 20 amp 18650 battery to recommend?

Any of these will perform about the same under the same conditions. Purchase the brand/model that you can find at a competitive price from one of the below trusted online battery suppliers. I believe Mooch is partial to the two 25 amp batteries.

AW 18650 3000 mah 20 amp CDR

LG 18650HG2 3000mah 20 amp CDR

Sony 18650VTC5, 2600 mah 20 amp CDR

LG 18650HE4 2500 mah 20 amp CDR

Samsung 18650-25R, 2500 mah 20 amp CDR

Sanyo UR18650 NSX, 2500 mah 20 amp CDR

Sony 18650VTC5A, 2500 mah 25 amp CDR

Samsung 18650-24S, 2500 mah 25 amp CDR

(new)
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[Darkkon]

Wow. Thanks Baditude

 

[VapeFreak]

Just picked up some Sony VTC5A' s at orbtronic for a great price

 

[t8kiteasy]

Missed a cell not used by many any more MNKE's,while only at 1500mah there punch lasts longer.