Battery power question

[mikeyb149]

Hi guys, not sure if this is right place so apologies if not.

I have a h priv 2 which apparently can run to 225w with dual batteries. I have been watching some of mooch vids which gave helpful formula for working out amps per battery etc. My question though is, is it possible to run that device at 200w with 2 18650s and if not, why make a mod with such a limit?

My math (correct if wrong) says

200w/2 batteries =100w per cell
100/3.2/0.9 = 34.7A

So.... Am i mad/mistaken or is it not possible to vape at that wattage. Or are there 40A batteries available that i cant find.
Thanks

 

[Jonnytc1]

I would say it's sales BS!

Sent from my SM-G975F using Tapatalk

 

[bombastinator]

Hi guys, not sure if this is right place so apologies if not.

. Might have gone better in general vaping or VV mods. Not a big deal IMHO. If the moderators don’t like it where it is they’ll move it.

I have a h priv 2 which apparently can run to 225w with dual batteries. I have been watching some of mooch vids which gave helpful formula for working out amps per battery etc. My question though is, is it possible to run that device at 200w with 2 18650s and if not, why make a mod with such a limit?

marketing.

My math (correct if wrong) says

200w/2 batteries =100w per cell
100/3.2/0.9 = 34.7A

So.... Am i mad/mistaken or is it not possible to vape at that wattage. Or are there 40A batteries available that i cant find.
Thanks

Nope. Only in the fevered minds of the marketers are there batteries that will do what they claim. Boost/buck circuitry will pulse up to that wattage maybe (or maybe not) but will eat your batteries really fast.

As soon as I saw “SMOK Priv” I assumed you had already broken the thing. They’re not known for reliability.

 

[mikeyb149]

I know people have had issues with smoks but it only cost me 30 for the mod and tank so why no i thought. Its not been bad so far.

 

[mimöschen]

Smok-chips calculate with a ridiculous max ampdraw of about 40A and max voltageoutput of 7.5V, so 100W per 18650 is possible. The VTC5A, Molicel P26A or LG HB can handle those ampdraws, but you're always exceeding their CDR, so it's absolutely not advisable, because it kills your cells faster than you can purchase new ones.
What matters the most for the max wattage you might get out of a device, is the resistance of the attached coil.
Smok dual devices, like the majority of all other dual cell mods, don't have boost circuitry, so the voltage of the cells is a huge limiting factor for moderate to high ohm coils, because outputvoltage varies between about 7.5V to 5V as the cells get drained. Therefore in a best case scenario the actual wattage range varies between 220W(limit of the mod) and 100W on a 0.25ohm coil with ampdraws between 30-20A.
With a 0.12ohm coil (the lowest ohm stock coil Smok offers that I know of), the difference might not be that noticeable (220W - 208W) at first glance.
But the higher the ampdraw, the more limiting are the used cells. No 18650 likes to put out 40A for a longer period, like say a 3sec puff, so the actual voltage of those cells breaks down rapidly. But even ignoring breakdown of the cells, with the max ampdraw of 40A, the max wattage you get is "only" 192W.

 

[Punk In Drublic]

The 225watt specification is a alot of marketing and a bit of fact. As @mimöschen pointed out the device does have limitations in terms of what voltage it is able to produce in order to achieve a prescribed wattage for a given resistance. So under very specific circumstances, it may reach that 225 watt limit. But in doing so you will exceed the recommended CDR of even the highest rated 18650 battery. You will not only stress the battery but run time will also be extremely short. And when you start factoring in the heat generated by operating at these wattages, you run a higher risk of both damaging your device or experiencing a cell failure. And keep in mind the 90% efficiency as noted in Mooch’s video is a best guestimate. We do not know the efficiency of many of these devices, especially when running them at their limits. So your current draw on the batteries will most likely be greater than what you calculated. Always a good practice to have some headroom.

But in Smok’s defence, they are not the only ones with these somewhat misinformed power ratings. The majority of dual cell devices are spec between 200 and 225 watts, all of which will put the same stress on the batteries if operating at that level. And like Smok, a lot of them will also have voltage limitations.

If you prefer to vape at those power levels, I would look into a 3 cell DNA device such as the Lost Vape Triade. At 200 watts, current draw at 3.2 volts will be roughly 24 amps per cell

 

[mikeyb149]

If you prefer to vape at those power levels, I would look into a 3 cell DNA device such as the Lost Vape Triade. At 200 watts, current draw at 3.2 volts will be roughly 24 amps per cell

Thankyou for the advice but i dont actually want to vape that high, I am happy at 50-60 watts. My question was more curiosity than anything.

 

[mimöschen]

In theory there are a few true 30A 18650 cells, like the Samsung 20S or LG HB4 for example, that are able to put out those 220W on a dual cell device without exceeding their CDR, but the biggest problem nevertheless remains the same: consistency.

 

[Punk In Drublic]

Thankyou for the advice but i dont actually want to vape that high, I am happy at 50-60 watts. My question was more curiosity than anything.

 

[Baditude]

WATTAGE PER SINGLE 18650 BATTERY on REGULATED MOD:
(Total wattage doubles using 2 batteries; Triples using 3 batteries.)

Up to 45W:

Samsung 18650 30Q, 3000 mah 15 amp CDR

Sony 18650VTC6 3000mAh 15 amp CDR

Up to 60W:

LG 18650HG2 3000mah 20 amp CDR

LG 18650HE4 2500 mah 20 amp CDR

Samsung 18650-25R, 2500 mah 20 amp CDR

Sanyo UR18650NSX, 2500 mah 20 amp CDR

Sony 18650VTC5, 2600 mah 20 amp CDR

Sony 18650VTC4, 2100 mah 23 amp CDR

​

Up to 75W:

LG 18650 HD4 2100 mah 25 amp CDR

LG 18650 HD2 2000 mah 25 amp CDR

Samsung 18650-24S, 2500 mah 25 amp CDR

Sony 18650VTC5A, 2500 mah 25 amp CDR

Molicel 18650-P26A, 2600 mah 25 amp CDR

​

Up to 90W:

LG18650HB6 1500mah 30 amp CDR

LG18650HB2 1500mAh 30 amp CDR

LG18650HB4 1500mAh 30 amp CDR

Samsung 18650-20S 2000mah 30 amp CDR

 

[sonicbomb]

My cars's speedometer goes to 160m MPH, but it won't actually go that fast and if I tried it would probably throw a rod.

 

[Hawise]

My question though is, is it possible to run that device at 200w with 2 18650s and if not, why make a mod with such a limit?

My math (correct if wrong) says

200w/2 batteries =100w per cell
100/3.2/0.9 = 34.7A

So.... Am i mad/mistaken or is it not possible to vape at that wattage. Or are there 40A batteries available that i cant find.
Thanks

Your math is correct, as is your understanding of the limitations of 18650 batteries. The 225 w limit means that the mod's circuit board can, under certain circumstances, provide 225 w (or so SMOK claims. I'd be wary of any claims by SMOK.) It does not mean any batteries exist that can safely provide that. As others have said, it's mostly down to marketing, though there's also a helping of frequent unsafe battery usage by vapers (as encouraged by manufacturers in this case).