How to make your batteries last longer between charges

[MegaVaper]

Hello everyone, I recently got the Wismec Reuleaux RX200s sitting under a TFV8 Octa coil. For simplicity I have a 200 watt regulated box mod on top of a .15 ohm tank. batteries are 3 18650 LGHG2s

My question is: Assuming the same amount of puffs, which wattage set up will my batteries last longest on before a recharge? or which set up will yield the most puffs before my batteries need a recharge? (*note* difference in time length of individual pull)

SetUp 1: 50watts/2.74volts at .15 ohms runs at 17.2 amps with 3 second pulls/puffs

SetUp 2: 120watts/4.24volts at .15 ohms runs at 26.7 amps with 1 second pulls/puffs

 

[bwh79]

Battery capacity is measured in mAh or milliamp-hours, which is amps * time.

Setup 1 uses 17.2 * 3 = 51.6 amp-seconds (51,600 milliamp-seconds, or 14.333 milliamp-hours) per puff.
Setup 2 uses 26.7 * 1 = 26.7 amp-seconds (26,700 mAs / 7.4166 mAh) per puff.

Setup 2 will use less charger per puff, and therefore get more puffs per charge.

*Edit: That's based on your given amp draws, which I'm now wondering how you calculated? Amp draw on a regulated mod is Watts/Volts (the amp draw will be the same at a particular watt setting, regardless of the attached resistance, which is why resistance does not appear in this calculation and why some people will tell you that "ohms don't matter" on a regulated mod). Using the batteries' nominal voltage of 3.7 volts, times 3 for 11.1, I get a draw of 50/11.1 = 4.5A on #1 and 120/11.1 = 10.8A for #2. Regardless, 3*4.5 is still more than 1*10.8 and so #1 will still use more charge per puff than #2, just not necessarily the amount worked out above...

 

[Two_Bears]

Hello everyone, I recently got the Wismec Reuleaux RX200s sitting under a TFV8 Octa coil. For simplicity I have a 200 watt regulated box mod on top of a .15 ohm tank. Batteries are 3 18650 LGHG2s

My question is: Assuming the same amount of puffs, which wattage set up will my batteries last longest on before a recharge? or which set up will yield the most puffs before my batteries need a recharge? (*note* difference in time length of individual pull)

SetUp 1: 50watts/2.74volts at .15 ohms runs at 17.2 amps with 3 second pulls/puffs

SetUp 2: 120watts/4.24volts at .15 ohms runs at 26.7 amps with 1 second pulls/puffs

Back off on the watts and choose an RDA or RTA you can rock with a single coil.

You have an atty that simply guzzles power and ejuice.

 

[MegaVaper]

*Edit: That's based on your given amp draws, which I'm now wondering how you calculated? Amp draw on a regulated mod is Watts/Volts (the amp draw will be the same at a particular watt setting, regardless of the attached resistance, which is why resistance does not appear in this calculation and why some people will tell you that "ohms don't matter" on a regulated mod). Using the batteries' nominal voltage of 3.7 volts, times 3 for 11.1, I get a draw of 50/11.1 = 4.5A on #1 and 120/11.1 = 10.8A for #2. Regardless, 3*4.5 is still more than 1*10.8 and so #1 will still use more charge per puff than #2, just not necessarily the amount worked out above...

Hi, Thanks for your answer. The amps and pull time are shown on the mods user interface while you take a hit. On your edit calculations you are calculating unregulated voltage? my mod is telling me the voltage based on the wattage I set it at.

 

[Winchester]

Hi, My answer RX200 with 3 Efest Authentic IMR 3500 mAh batteries with a Vulcan Vector RDA dual 0.3 coils 25ga. Kanthal wire. RX200 set at 35watts lasts almost all day.

 

[bwh79]

Hi, Thanks for your answer. The amps and pull time are shown on the mods user interface while you take a hit. On your edit calculations you are calculating unregulated voltage? my mod is telling me the voltage based on the wattage I set it at.

Since we're talking about battery life, I'm calculating voltage and amp drain on the input/battery side of the regulatory circuitry, not the output/atomizer side.

 

[MegaVaper]

@bwh79 Isnt the battery life determined by the output? voltage and amp drain are determine on the output side. Im confused. Input side?

@Two_Bears @Winchester yea, im thinking of picking up a kayfun v5 and going .8 ohm single coil. Multiple coils at low ohms just seem like flavor and battery killers. And I want battery life and flavor. Im now learning how useless sub-ohm builds are.

 

[Canadian_Vaper]

Thinner Wire... 28g SS 316L should give decent ohms in a dual coil setup and have pretty much no rampup time and can be run at very low wattage...

 

[bwh79]

@bwh79 Isnt the battery life determined by the output? voltage and amp drain are determine on the output side. Im confused. Input side?

No matter what wattage or voltage output your device is set to deliver, the battery only ever outputs a single voltage to the device, equal to its present charge state. Nominally (a fancy word for "most of the time"), this is about 3.7 volts although it varies from about 4.2v at full charge, down to around 3-3.2v when it will need to be recharged.

Wattage in equals wattage out (plus or minus a few percent to power the device itself), so if the device is delivering 50 watts to the atomizer, then we know it is drawing (roughly) those same 50 watts from the battery. Three cells wired in series output a nominal voltage of 11.1 volts. These 50 watts are coming from the batteries, and they're coming from the batteries at 11.1 volts. 50 watts at 11.1 volts works out to a current of roughly 4.5 amps. It doesn't matter what voltage the device is outputting to the atomizer (that will depend on the attached resistance), as long as you have it set to 50 watts (and as long as the batteries are about middle-of-the-way charged), the amp draw on the batteries is always going to be the same 4.5 amps. At 2500 mAh or 2.5 amp-hours, your LG batteries can sustain this output for about 33.3 minutes of constant duty or about 666 three-second puffs (twenty puffs = one minute of active duty.)

A similar calculation leads to 10.8 amps drawn from #2 for about 13.8 minutes of firing or 833 one-second puffs.

 

[Two_Bears]

@bwh79 Isnt the battery life determined by the output? voltage and amp drain are determine on the output side. Im confused. Input side?

@Two_Bears @Winchester yea, im thinking of picking up a kayfun v5 and going .8 ohm single coil. Multiple coils at low ohms just seem like flavor and battery killers. And I want battery life and flavor. Im now learning how useless sub-ohm builds are.

For me the sweet spot is .8-.9 ohms. Always single coils

 

[sofarsogood]

Hi, My answer RX200 with 3 Efest Authentic IMR 3500 mAh batteries with a Vulcan Vector RDA dual 0.3 coils 25ga. Kanthal wire. RX200 set at 35watts lasts almost all day.

I vape 7 ml per day on a 1.40 ohm single coil, at 30 watts, and 400 degrees. A single LG HG2 lasts me all day. My experience with multiple batteries wired in series is they may allow watts beyond 75 but the endurance stays the same as a single cell. To get more endurance from multiple cells they need to be wired in paralell. I learned the endurance lesson from a cuboid and vtc mini which use the same board and have puff timers. Since I never go above 30 watts the cuboid doesn't get used.

 

[BrotherBob]

set up will my batteries last longest

It's a trade off with batteries, in general:
In General
Lower Ohm Coils/Higher Wattage Vaping Will:
Heat The Coil Faster
Produce More Vapor, can mute taste (coat mouth/build up)
Drain The Battery Faster
Use E-Juice Faster
Produce A Warmer Tasting Vape
Shorten Coil Life
Shorten Wick Life
More PV Maintenance/Issues
More irritation to non vapers (tends create more negative comments regarding cloud production)

In General
Higher Ohm Coils/Lower Wattage Vaping Will:
Heat The Coil Slower, Which Will Produce “Less” Vapor
Provide A “Cooler” tasting vape, may produce more flavor.
May Use Less E-Juice (>$)
Prolong Battery Life (>$)
Prolong Coil Life (>$)
Prolong Wick Life (>$)
May Result in Less PV Maintenance/Issues
Less irritation to non vapers
Aids stealth vaping

 

[KenD]

Hello everyone, I recently got the Wismec Reuleaux RX200s sitting under a TFV8 Octa coil. For simplicity I have a 200 watt regulated box mod on top of a .15 ohm tank. Batteries are 3 18650 LGHG2s

My question is: Assuming the same amount of puffs, which wattage set up will my batteries last longest on before a recharge? or which set up will yield the most puffs before my batteries need a recharge? (*note* difference in time length of individual pull)

SetUp 1: 50watts/2.74volts at .15 ohms runs at 17.2 amps with 3 second pulls/puffs

SetUp 2: 120watts/4.24volts at .15 ohms runs at 26.7 amps with 1 second pulls/puffs

You're calculating the amp draw wrongly though. On a vw mod the formula is:

Watts / battery cutoff voltage = amps

So, 50w
50 / 9.6 (three batteries in series, 3.2v cutoff) = 5.2 amps

120w
120 / 9.6 = 12.5 amps

That doesn't account for chip inefficiency though. Best to add at least 10% to the watts in the calculation to account for that.

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