increasing battery life with high Ohms.

[bencooper74]

I'm a little new to vv/ww and to rebuilding. I'm not sure if this has been discussed here or not yet. Forgive me If I'm rehashing an old topic.

Any way my theory is that if I vape any coil at 10 watts the result should be similar. According to ohms law a 2ohm coil at 10 watts uses 2.2 amps. if you use a 4ohm coil at 10 watts it's only 1.6 amps. So would I get more battery life using the 4ohm coil?

 

[edyle]

No.

Conservation of Energy.

10 watts is 10 watts whether you vape on a 2 ohm coil or a 4 ohm coil.

A difference in battery life would be due to the efficiency for the voltage regulator; you will have more energy loss raising voltage to work the 4 ohm coil.

2 ohm @ 10 watts: 4.5 volts
4 ohm @ 10 watts: 6.3 volts

The battery is 4.2 volts at most, so you get some losses in the eletronics in raising the voltage.

 

[p.opus]

I'm a little new to vv/ww and to rebuilding. I'm not sure if this has been discussed here or not yet. Forgive me If I'm rehashing an old topic.

Any way my theory is that if I vape any coil at 10 watts the result should be similar. According to ohms law a 2ohm coil at 10 watts uses 2.2 amps. if you use a 4ohm coil at 10 watts it's only 1.6 amps. So would I get more battery life using the 4ohm coil?

I understand the reasoning, but to get 10 watts at a 4 ohm coil you need higher voltage (6.32 volts, which is beyond the range of most mods out there.) And to get that 3.7 volt cell to product 6 volts, you need to go through a boost circuit which produces it's own drain on the battery.

Now whether or not the stress on the battery to get to 6 volts is equal to the higher current drain, I can't tell you, I'm not an electrical technican, but I do know that you don't get anything for free.

So I imagine the discharge on the battery is roughly the same.

 

[bencooper74]

ok thanks...I just go through batteries so quickly I thought I might have found a trick to go a little longer without a charge. I guess there are no short cuts. Now I just have to find 8000mah 18650 lol.

 

[edyle]

ok thanks...I just go through batteries so quickly I thought I might have found a trick to go a little longer without a charge. I guess there are no short cuts. Now I just have to find 8000mah 18650 lol.

Well if you are vaping 10 watts yes you will be going through batteries pretty fast.

Typical coils have been running 5 watts.

These new dual coils coming out end up running 5 watts EACH for a total of 10 watts.

 

[bencooper74]

Well if you are vaping 10 watts yes you will be going through batteries pretty fast.

Typical coils have been running 5 watts.

These new dual coils coming out end up running 5 watts EACH for a total of 10 watts.

Yeah I was a very heavy smoker 2 PAD of non-filtered rolling tobacco. And I need strong hits and very often to keep me from the stinkies. What can I say...I'm an animal.

 

[edyle]

Yeah I was a very heavy smoker 2 PAD of non-filtered rolling tobacco. And I need strong hits and very often to keep me from the stinkies. What can I say...I'm an animal.

What nicotine strength do you use, 24mg or 18mg?
And what tanks do you use?

 

[bencooper74]

What nicotine strength do you use, 24mg or 18mg?
And what tanks do you use?

I mainly vape either 24 or 18. sometimes in the morning I like it a little lighter at 12mg. I don't like tanks I drip in a smoktech RDA.

 

[edyle]

One way to save of batteries is to keep a few of these handy at home

Too bad they don't come in VW, only VV so far.

 

[bencooper74]

I have an ego pass-through non-vv. Don't really like the way it hits though. I was thinking about the MVP2 but I just don't like the box look. I recently got the Sid which I love....I just need to carry some extra batteries with me I guess.

 

[edyle]

I have an ego pass-through non-vv. Don't really like the way it hits though. I was thinking about the MVP2 but I just don't like the box look. I recently got the Sid which I love....I just need to carry some extra batteries with me I guess.

I recently discovered theres such a thing as an ego V3 VW

I guess Innokin's iTaste vv V3 how has some competition.

 

[destinkarette]

Honestly the mvp2 is a pretty good device. Mine usually lasts 2 days or a little over 750 hits at between 7.5 and 8.5 watts. If you can go to a local b&m and take a good look at one.

 

[PaulBHC]

Well if you are vaping 10 watts yes you will be going through batteries pretty fast.

Typical coils have been running 5 watts.

These new dual coils coming out end up running 5 watts EACH for a total of 10 watts.

I have BDC coils at 1.8 and my MVP set at 7.0w. You are telling me it is actually double?

Benny I have one of those VV passthroughs on my computer and really like it.

 

[zapped]

I understand the reasoning, but to get 10 watts at a 4 ohm coil you need higher voltage (6.32 volts, which is beyond the range of most mods out there.) And to get that 3.7 volt cell to product 6 volts, you need to go through a boost circuit which produces it's own drain on the battery.

Now whether or not the stress on the battery to get to 6 volts is equal to the higher current drain, I can't tell you, I'm not an electrical technican, but I do know that you don't get anything for free.

So I imagine the discharge on the battery is roughly the same.

Hopefully someone else will chime in here that can explain this better than me but this information is incorrect.

It has to do with discharge rates.Imagine a battery as a water faucet and the current is water.

1.7ohms offers less resistance than 3ohms so the current flows faster and the battery discharges quicker.

I didnt believe it either, sounded completely backwards to my way of thinking in fact, but I get two more hours from a 3ohm carto and an 18650 than I do from the same 18650 and a 1.7ohm carto.

 

[edyle]

I have BDC coils at 1.8 and my MVP set at 7.0w. You are telling me it is actually double?

Benny I have one of those VV passthroughs on my computer and really like it.

If you have 7.0 watts on a dual coil then each coil is running at 3.5 watts.

 

[edyle]

Hopefully someone else will chime in here that can explain this better than me but this information is incorrect.

It has to do with discharge rates.Imagine a battery as a water faucet and the current is water.

1.7ohms offers less resistance than 3ohms so the current flows faster and the battery discharges quicker.

I didnt believe it either, sounded completely backwards to my way of thinking in fact, but I get two more hours from a 3ohm carto and an 18650 than I do from the same 18650 and a 1.7ohm carto.

That only makes sense if you are using just a battery like in a mech.

 

[Flavored]

Hopefully someone else will chime in here that can explain this better than me but this information is incorrect.

It has to do with discharge rates.Imagine a battery as a water faucet and the current is water.

1.7ohms offers less resistance than 3ohms so the current flows faster and the battery discharges quicker.

I didnt believe it either, sounded completely backwards to my way of thinking in fact, but I get two more hours from a 3ohm carto and an 18650 than I do from the same 18650 and a 1.7ohm carto.

Yeah, you’re right, batteries are rated in amp-hours (or, in our case milli-amp-hours), so less current means more time. The math isn’t pure like the numbers in the OP since there is an efficiency factor of the electronics that has to be accounted for. The batteries are “boosted” then regulated down to the desired voltage necessary for the watts/volts selected. But, generally speaking, higher ohms at the same watts will mean longer battery life. Higher ohms can, however, get you at the limits of your device’s capability to produce the voltage/watts, and higher ohms usually means more turns, more surface area for heating. What that means is the vape will be different if you do that, imagine 10 watts spread across a larger “oven burner,” the burner temperature will be less (watt density would be the technical term, I think). You may like it better, may not.

 

[PaulBHC]

I took the vv passthru with me on the road today. Plugged into an iphone lighter adapter, it worked great.