0.15 ohms build. Yay or Nay?

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BuzzKilla

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That is the pulse rating chart for VTC5's. They say that it is safe to run them at 50 amps for 40 seconds. The only way this can become a hazard is if someone's mod began autofiring and the owner wasn't aware.

that pulse rating is there for electronic manufacturers... they use the pulse rating WITH a calculated cooldown period.

IT IS NOT THERE FOR US AS VAPERS TO ABUSE.

a dead short is a dead short, no mater how you look at it.
If you want to play in the red zone, that is completely up to you.
Just dont advertise it as "safe".
 

suspectK

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You are of course correct, but with a fully charged battery at 4.2V, the coils would be pulling 28A.

I decided to back right down and remove those coils though because I'm just not comfortable at that level. I'm so pained though, because they were 99.99% perfect. That said, I'd rather live and learn. :)

You did the right thing here..

Although you're not going to get 4.2 Volts/Static Voltage off a fresh battery, I find my current needs from 4.2 Volts, and I stay in the continuous ratings of the battery...regardless vaping is a pulse function...well, I'll let buzz finish this statement..
that pulse rating is there for electronic manufacturers... they use the pulse rating WITH a calculated cooldown period.

IT IS NOT THERE FOR US AS VAPERS TO ABUSE.

Even though it's right above my post...it won't hurt for some people to read it more than once..
 

xibxang

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Just a quick update. In the end I made myself a pair of twisted coils on 28 gauge Kanthal A1 that came in at 0.25 ohms. That comes in at a theoretical 16.8 amps which - for me - is a personally acceptable margin. My vaping journey from a Kanger starter kit to this build is only one month old so it's been quick, but in that time I've researched the wazoo out of my new hobby (I'm quite the nerd, like most of us) and - thanks in no small part to this forum - I feel I've arrived at a comfortable spot.

Additionally, I've found that I seem to really get on with twisted coil builds. They heat much more slowly than parallel coils and have a decent surface area which allows me to take nice, long pulls and blow out a nice thick plume of vape. Of course, "nice" is an all-the-way subjective concept but you guys know what I mean. I think that at some point down the line, I'd build a 0.15 ohm dual parallel coil for the occasional bit of "stunt vaping" but not for my everyday needs. Maybe once the Sony VTC10 comes out. :)
 

Baditude

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that pulse rating is there for electronic manufacturers... they use the pulse rating WITH a calculated cooldown period.

IT IS NOT THERE FOR US AS VAPERS TO ABUSE.

a dead short is a dead short, no mater how you look at it.
If you want to play in the red zone, that is completely up to you.
Just dont advertise it as "safe".

:thumb: This! Below is an email response to a customer's inquiry from Sony:

"I recently purchased some Sony VTC5 18650 batteries from an online vendor. They listed the battery specs on their website, but I wanted to double check with Sony before I started building my setup. I couldn't find anything on their website, so I emailed them. Here was their reply:

"Dear customer, thank you for your inquiry.

The 18650 type batteries are no longer manufactured by Sony. This product was never intended for individual, public sale and are not eligible for warranty or engineering support.
It was only available to OEM makers of specific devices.

The specifications and markings on the battery may vary depending upon the OEM’s requirements. Therefore, it is difficult to determine the true manufacturer or authenticity of the batteries without physical inspection and manufacturing code research.

This type of battery is widely available on the internet market through non-authorized resellers.
Therefore, Sony is not liable for the performance or use of this type battery for non-intended purposes.
Such applications should be done at the user’s own risk.
Furthermore, any battery of this type claimed to be Sony brand may be older stock.
We apologize that we cannot offer further assistance with this matter.
Sincerely,
Media Services by Sony"
http://www.reddit.com/r/electronic_cigarette/comments/2cttd4/sony_vtc5_18650_notice_from_sony/

In other words, these battery manufacturers do not approve of us using these batteries in APV's in the first place. They were never intended to be used singly, but used as multiple batteries in battery packs with protection for other applications.
 
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Bunnykiller

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With a VTC4 or VTC5, that build is completely safe. My all day vape is around .2 and totally fine. I have 2 3mm airholes and leave a space under my coil for better airflow and my vape is actually cold.

I know many people that go below .1 ohms with VTC batteries and have never had a single one vent. Lots of people on here are fine with their VV's and clearos and don't understand why some vapers like to go low into the sub-ohms. I like a nice, cool vape with big clouds and that's what I have. A couple drags at 3mg an I'm set for a few minutes.

and I know alot of people who drive 90mph in a 60 mph zone too.... given time they will have an accident
 

BuzzKilla

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I'd wager that most ohm checkers aren't calibrated to be more accurate than +/- a tenth of an ohm.

I'd wager that a $10 (retail) ohm reader is as accurate as a mule... for the first few weeks.

i have yet to find two ohm readers that read the same... just saying.
the greatest difference i've seen was 0.8 ohms.


Mine reads lower than most, so i like mine as it errors in the right direction.
 

suspectK

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Let's talk regulated. Sigelei is coming out with a dual 18650 100 watt mod. The dual batteries in parallel will give a "safe" 60 amps and, according to their web site will fire down to .1 ohm. I have seen other mods with dual batteries and boards I do not know about that claim 150 watts.
Wrong...series battery- doubles voltage. Parallel battery- doubles capacity. That is it...you don't double the current ratings when you use two batteries.
 
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