Why do you need a higher voltage battery for low resistance cartomizers.

[vaporbird]

I'm a mathematics professor, so I'm pretty embarrassed that I can't figure this out. Here are the things I have gathered from my reading (let me know if I get any of this wrong.)

• 3.0 Ohms is about the normal range of resistance for eGo's and 510 batteries which are around 3.7 V
• Lower resistance will drain the battery faster.
• too much resistance and the coil won't heat up.
• one should have a battery with more than 3.7 V to use LR carts. (?)
• Very high voltage batteries 5V and up require *high* resistance carts that won't even light up on a 3.7 V battery.
• One way to have higher resistance is to have more coils (dual and tripple coil)

Ok, out of all of that this notion "one should have a battery with more than 3.7 V to use LR carts" is puzzling, I realize that LR will drain the battery faster... but isn't that best fixed by having a battery with bigger capacity, rather than higher voltage output?

What's going on?

I have tried a LR on my 3.7 batteries and the TH was super hot and not to my liking. Would having a 5V battery make it less harsh... or is it going to be even worse? Since I'm in to "vapor volume" isn't what I need something with more coils (and thus higher resistance) on a 5V battery?

I have a 5V passthrough on the way, and I'm trying to understand what I'll want to pair it with.

 

[Traver]

Ok, out of all of that this notion "one should have a battery with more than 3.7 V to use LR carts" is puzzling, I realize that LR will drain the battery faster... but isn't that best fixed by having a battery with bigger capacity, rather than higher voltage output?

The reason for using lower ohm carts is the they use more power or watts. More watts give you a more smoke, hit and flavor. So if you are using a 3.7 volt battery you can get a more intense vaping experience with a lower ohm cart. You are right the lower the ohms the faster it will drain your battery. It will also make the vapor harsher or more intense as I like to phrase it. If you are using a cart rated at less than 2.0 ohms you really should be using something larger that a standard ego.

When you say 3.7 volts do you mean a battery that delivers 3.7 volts to the cart? An ego for instance is regulated to deliver only 3.2 volts. Anyway you will have to experiment and find what works for you. Personally I like to vape at around 5.0 watts. For me That usually means a 2.8 ohm cartomizer and a battery with a working voltage of 3.7 volts

 

[madjack]

...LR stuff is meant for 3.7v batts so as to simulate using higher voltages(with higher ohm cartos)...you don't need higher voltage for LR cartos, the opposite in fact...what you need is a 3.7v batt with a higher than 450mah rating such as the eGo/Riva/Kgo that are rated at 650mah and up...the slimline(ciggy lookalike) batts are only in the 100-340mah range and cannot handle the current draw of LR gear and should not be used with anything LR.........
madjack

 

[vaporbird]

Thank you, this is helping a lot!

Another things that confused me was a website that said "New mega dual coil Cartomizer contains dual 3.2 ohm coils in parallel, giving a total resistance of approximately 1.6 ohms." so more resistance in parallel means less over all resistance?

I'm confused.

 

[txtumbleweed]

Yes when you put them parallel it cuts the resistance in half.

 

[Eddie.Willers]

...Another things that confused me was a website that said "New mega dual coil Cartomizer contains dual 3.2 ohm coils in parallel, giving a total resistance of approximately 1.6 ohms." so more resistance in parallel means less over all resistance?I'm confused.

<smart-... hat>
Mathematics professor, eh?

Resistances in series, calculate the sum of the resistances: R1 + R2 = R3 (so, 1.5 ohms plus 1.5 ohms = 3 ohms)
Resistances in parallel, calculate the sum of the reciprocals: 1/R1 + 1/R2 = 1/R3 (so, 3 ohms plus 3 ohms, in paralell = 1.5 ohms)

</s-a hat - and wonder if that's correct>

 

[madjack]

<smart-... hat>
Mathematics professor, eh?

Resistances in series, calculate the sum of the resistances: R1 + R2 = R3 (so, 1.5 ohms plus 1.5 ohms = 3 ohms)
Resistances in parallel, calculate the sum of the reciprocals: 1/R1 + 1/R2 = 1/R3 (so, 3 ohms plus 3 ohms, in paralell = 1.5 ohms)


</s-a hat - and wonder if that's correct>

...yep...the voltage to both is the same but the amperage, thus the wattage is split between the two coils which is why you can run them on higher voltage and not boil/scorch/burn your juice......
madjack

 

[robblundberg]

i use 2.0 lr carto's on my 808 mini batt's just fine.....

 

[JD1]

Five to six watts in my 'sweet spot' also. I've tried several different things, and I've settled in on 2.0 ohm attys and 2.5 ohm topcoils to satisfy my needs, with the exception that I do need to pick up some higher ohm topcoils for my 5 volt PT. ( I have a joye ego, an e-power and a 5v PT).

Here's a link to a handy calculator. Ohm's Law / Watt's Law Calculator

 

[Eddie.Willers]

Yes when you put them parallel it cuts the resistance in half

Not quite - it's only half if you have two coils.

What about triple coil cartos?

For example: 3 coils at 5 ohms each in parallel gives 1.67 ohms total

As madjack says - it's all about splitting the total wattage consumption over a number of coils to reduce the likelihood of hot-spots and burnt juice.

 

[markfm]

Overall, for low resistance you do want higher milliamphour (mAh) ratings, more than much higher voltage.
The dual could are the one exception, and only to the extent that you want a device with high enough voltage to cleanly use a 3 or 3.2 ohm carto, since the power is split across two resistances in parallel.
Batteries have a "C" rating, which expresses how many milliamps, the maximum current draw, the battery is able to deliver cleanly (safely, without shortening battery life). Trying to pull too many amps out of a little battery will lead to early failure.

The other thing is that the batteries in many pvs have surrounding circuitry. There may be components rated to 2A, if you are trying to draw more than that you can, again, have an early device failure.

I use variable voltage mods, and the vendor recommended batteries.The mods have specific protection circuitry which kicks in if I am trying to pull too much power. The underlying batteries are also fairly high capacity, can safely handle brief multi-amp draw while vaping.

 

[vaporbird]

ah! I had "parallel" confused with "in series" --I should really take some time to study electrical current.

 

[Traver]

Think of it as two water pipes. At the same pressure you will get twice as much water as you would from one pipe.

Batteries have a "C" rating, which expresses how many milliamps, the maximum current draw, the battery is able to deliver cleanly (safely, without shortening battery life). Trying to pull too many amps out of a little battery will lead to early failure.

Overdrawing can also lead to runaway battery fires. Either when vaping or charging. It has happened to vapors. Even at 5 watts I prefer to use high drain AW IMR batteries.

 

[BloodWolf]

Oh yeah ? Well I can do this.......(rubs tummy and pats head)

 

[Iffy]

Oh yeah ? Well I can do this.......(rubs tummy and pats head)

 

[Tersur]

Iffy i hope you dont mind but i totally ripped off that pic for future use.