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How low do you go? Super Subbing
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Nihilum Offline
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Post: #11
RE: How low do you go? Super Subbing
I had a failure on my big custom yesterday...luckily it was just the pin on the bottom of the RDA.  However, I tested my most recent coil with a multimeter and OMG...it read .01 Ohms...turns out the "RDA building Ohm Meters" that I have aren't accurate below .5 Ohms.

So...what did I do?  I hit it a few times anyway...it's got fuses and stacked MOSFETs so at least it wont vent.  Anyway, tore it out and rebuilt.  Sitting at .06 Ohms.  20ga, single strand, 5 wraps.

Also, just ordered another custom box from SOS.  It's a dual 26650 series box.  I'll post pics when it's finished.
04-04-2015 04:01 AM
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Michael Offline
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Post: #12
RE: How low do you go? Super Subbing
Yikes mate, glad that turned out ok. A failure like that could have turned bad fast. Pretty much any screw-on ohm reader is gonna be inaccurate below about .2 at the very minimum. A multimeter will do better, but if you want to be really accurate you've gotta get a micro ohm meter, and unfortunately those things cost quite a pretty penny. Much safer just to build a little higher. 
04-04-2015 05:37 AM
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Galaxyrider Offline
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Post: #13
RE: How low do you go? Super Subbing
(21-03-2015 11:03 AM)Don Wrote:  For a single 18650 |i never go below 0.2

In fact, on just about anything I don't go that low.

More volts is better than more amps.

And round cells really shouldn't have a place in vaping - they are being pushed too close to increasingly exaggerated limits.
Ive been meaning to ask you about the double battery rigs.. Tank Crossing, Explorer, the Vertex.. I know thats ones a triple, but if you would.. explain the battery set up I was told that it gives much better battery longevity. I was told about buying the batteries at the same time, charging them at the same time, and only using them together in THAT particular mod. I dont go below .3 or .4.. usually, I have my coils made in advance, and have my comfort zone. If you would.. explain what you said about volts being better than amps?

Onward.. through the Fog!
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(This post was last modified: 11-04-2015 01:38 PM by Galaxyrider.)
11-04-2015 01:36 PM
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Michael Offline
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Post: #14
RE: How low do you go? Super Subbing
Phoenix, the way Ohm's Law works is that amps, volts, watts and ohms are all interrelated. Wattage is how much work the atty is doing, voltage is how much power the battery is supplying, and amperage is how hard the battery is working. So you can get the same amount of work done (watts) by using more cells to put out more power (volts) and by doing so you're letting the battery not work as hard (amps). It's kind of confusing since the terms mean very similar things, so here's an example. Let's say someone builds a .1 ohm build for a mechanical mod. When fully charged, a single 18650 has around 4.2V max output. To find the amperage, we'll use the formula:
Amps=Volts/Ohms
Amps=4.2/.1
Amps=42
As you can see, that is definitely not a safe build for any single 18650, because there isn't a single cell on the market that has a 42A or higher amp limit. So we do some more math, and find out that the wattage would be 176W. That's how much work the atty is doing. But if we were using two cells, then the max voltage would be 8.4V to get the same wattage. Plugging the numbers back in, you'd be looking at 21A. So you're getting the same amount of work done (176W) with more volts and less amps, which makes it much safer for your battery. 
Hope that helped, sometimes I get too scientific but I want to show why it works that way. 
11-04-2015 04:16 PM
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Nihilum Offline
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Post: #15
RE: How low do you go? Super Subbing
It's funny to me how there is a big thing going around saying round batteries have no place in vaping...lol.  If you're using well built mods, with top end components, decent batteries,  and your half competent...round cells are perfectly safe and effective.
12-04-2015 08:45 AM
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Michael (04-12-2015)
Don Offline
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Post: #16
RE: How low do you go? Super Subbing
If you can take the bulk. Lipos massively exceed the current delivery capability of round cells. And can do so in rather small and light packages.

TVF tested battery info to be found here

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12-04-2015 11:58 AM
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Michael (04-12-2015)
Pulsar Offline
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Post: #17
RE: How low do you go? Super Subbing
Lipos can and do violently fail also... that said, I need to go order up some fets for my lipo box mod 

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12-04-2015 03:57 PM
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Michael (04-12-2015)
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