Confused about ohms, voltages etc

[wildarmtins]

Ooookay. Currently using a Vogue 510 bsg that has 180mah and outputs at 4.2v apparantly. I've ordered an eGo variable voltage battery with 900mah and goes between 3.2v and 4.2v. The boge cartos I'm using have a resistance of 3ohms so 4.2 is a good voltage for them.
Here's where I'm getting confused....
I've ordered some Kanger 510 LR cartos that have a resistance of 2.7 to 3.1 ohms, and it says you need a battery of at least 450mah to use them properly. Now the resistance is fairly similar to the boges, so why the sudden incrase in required mah?

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[Off Topic]

More mah gives you longer battery life between charges.

I don't recommend anything below 600mah to anyone for any system. Seems silly to me having less than 6 hours of power in your hand.

With VV it all boils down to taste. Different people like different juices at different levels of heat. Play with it, find out what you like.

I wouldn't call 2.7ohms low resistance.

 

[wildarmtins]

Let me just get this straight, LR does stand for low resistance right? If so, then why are they marketing 2.7 ohm as LR? Is it something to do with the horizontal coil in the kanger?

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[mwa102464]

Your 3ohm Cartos wont be to good at 3.2v-4.2v you will need to up your voltage from anywhere to 4.6-5v to get the right performance from your 3ohm carto's/ the Kanger LR's I dont think are 2.7-3.1 and most likely half of that at 1.4-1.6ohm's and using 2 x 2.7 coils which will cut the ohms in half, and with LR yes you should have a bigger mAh Batt like a 900mAh or higher. Also be a bit careful running very low resistance with Ego type Batts, if you heat up the connection will fail at the Mosfet and your Batt could go bad if this connection fails, best to set up 2 of those Batts and rotate them, of give your single Batt a little rest in between vapes.

 

[Rule62]

I don't understand why a company would market 2.7 ohm cartos as LR. LR are usually 2.0 and below.

 

[wildarmtins]

I ordered these from vape escape..... oh wait...... I'm a tard.... the ones I ordered are 2ohms...... sorry fellas

I still don't get why you need a larger mah for using a lower resistance carto though. Surely lower resistance means less volts needed so less power used?

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[Dana A]

Try and get some LR Boges. I buy mine @ High Desert E cigs. I never had an EGO before so I'm not sure but I think you may need an EGO to 510 adapter. They are only a few bucks tho. Good luck.

 

[Off Topic]

510 works on an ego head without an adapter.

Low resistance means more power, so you need more battery to feed it.

You can run LR on a 180mah battery, I've done it. But I was getting 90 minutes out of a fully charged battery.

 

[Rule62]

I ordered these from vape escape..... oh wait...... I'm a tard.... the ones I ordered are 2ohms...... sorry fellas

I still don't get why you need a larger mah for using a lower resistance carto though. Surely lower resistance means less volts needed so less power used?

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Not exactly. If you were using a 2.0 ohm carto on a 4.2 volt device, you would be drawing 2.1 amps. If you used a 3.0 ohm carto on the same 4.2 volt device, you'd be drawing 1.4 amps.

 

[wildarmtins]

Ahhh gotcha. Thanks for the help

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[Reidus]

Ah! So amps=volts/ohm! This also explains why cartos burn out if the ohms are too low for the voltage.

 

[Eddie.Willers]

Not exactly. If you were using a 2.0 ohm carto on a 4.2 volt device, you would be drawing 2.1 amps. If you used a 3.0 ohm carto on the same 4.2 volt device, you'd be drawing 1.4 amps.

Which is very true, Rule62.

However, 1.4 amps (ie:1400 milliamps) would give 1 hour of continuous use on a 1400mAh battery, whereas 2.1 amps on the same battery would only give 40 minutes.

The battery's capacity in mAh is an expression of how long, in theory, it could be run for at a particular discharge rate. Take the mAh rating of the battery and divide it by the mA consumption of a particular coil to find the theoretical run-time.

 

[Reidus]

Whoosh! Which is why I'm an accountant, not an electrician, lol.

 

[Jammin J]

This Wattage Chart is great if you don't want to do the math, though it never hurts to know Ohms law and how all the elements work together.

Thank you Atomizer Mizer for originally posting the excell sheet

J