Stacking

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dice57

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Well you can, but not for long, and live to tell the tail. Stacking is never a good idea, especially with dangerous protected battery chemistries. There are just so many safer ways to get high watt vape, stacking is NEVER a smart or safe option.
 

Baditude

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I agree with the above. The potential benefits of stacking batteries in a mod do not outweigh the potential dangers.

Stacking batteries increases overall voltage. It does not increase battery time, a commonly believed myth. Your regulated mod already makes its own higher voltage due to its power regulator - why do you need more battery voltage?

Stacking does not increase battery capacity (mAh). Stacking two 18350 700 mAh batteries will not double your battery time of use, it will be the same as if you were using a single 18350 700 mAh battery (about 6 - 7 hours vape time). If you use a single 18650 2000 mAh battery (like an AW IMR), you'll get an entire days vape on a single battery.
 

Confuzzled1969

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I don't have much experience with it in vaping, but I know about batteries and such in my professional life. Batteries in series should always be from the same lot and once a string of batteries are used together one should never introduce different batteries in that string. I have the Vamo V5 and I do use two 18350's in series, but I have two sets and always keep them together. The other thing I do not do, run them all the way down.

Batteries have a finite life, and L-ion batteries are no different, where they are different from ni-cd for instance, is the way they perform. Where ni-cd like to be fully discharged before being charged, L-ion batteries do not like to be fully discharged. If you've every had a cell phone that you never charged until it was dead, you probably noticed your battery did not last very long and it's life got worse everytime.

That is the one drawback to L-ion batteries, they do not like to be used below about 50% to 60% of capacity. Running them down below that on a routine basis will drastically effect their lifespan, performance, and their electrical characteristics. Their internal resistance will start creeping up and once that happens the entire set (if in series) should be replaced with new ones, again from the same manufacturing lot.

Baditude is correct about capacity, if you stack two 18350's the mah is identical, but the voltage is higher, thus allowing one to produce more power.

I maintain large capacity 3 phase uninterruptable power supplies(UPS) with either 30 or 40 battereis in series, and I'm talking large batteries, like 80 lbs each with around 400 watts per cell or 2.4 kW per battery. In the UPS world, batteries are our biggest problem. There have been a few forrays into using L-ion batteries, but they are very finicky and if the customer does not have a robust monitoring and replacement program, they are not usually reccomended due to the problems when batteries age. The older the battery, the better the chance for catastrophy.
 

Bunnykiller

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Since the Vamo is designed to handle stacked 350's.... yes but standard IMR 350's the protected types seem to not play well with the circuit board in the vamo.. causes it to turn off alot.... ( actually the protectors turn off since the vamo will draw an initial surge which seems to be higher than the protectors like)
 

Bunnykiller

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Well you can, but not for long, and live to tell the tail. Stacking is never a good idea, especially with dangerous protected battery chemistries. There are just so many safer ways to get high watt vape, stacking is NEVER a smart or safe option.

its a Vamo5.... max wattage of 15 :)
 

JohnnyBGoode

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I never seen a good reason in stacking, even in vamos. It only gives you 6v max anyway. A single 18650 nearly always outperforms 2 x 18350s. Maybe in the mech world it could make sense.
Running them in parralel is a different story of course since you split the load and could draw a nice high amp but I rarely ever feelt the need to run in series for vaping.
 

dice57

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The neat thing about VV/VW mods is that it wont allow you to over discharge the batteries.... it shuts itself off at 3.2V ( or 6.4 stacked version)....

umm yeah, in theory, but there is such a thing as a short circuit, and protected regulated mods have been known to blow a fuse, short, whatever, and vent the batts. I Know this for a fact. Only takes one smoking gun to make one re-evaluate there battery choices, care and maintenance, if they survive. There is no such thing as totally safe, risk free vaping, but correct choices, and high amp batts, can certainly help even the odds a tad. Just saying. :D

I build and choose for the 1 in a thousand worse case scenario's, and has more than likely saved my azz more than once, and likely should be read as has. Locked firing switches, accidental dropping, heck, you don't really need air bags and seat belts, grew up without them, and I survived, but the industry seems to insist that I do, and the police seem the think that if I don't click it, they can give me a ticket. Or something like that.

Yeah, accidents do happen, and the will happen to you, if one vapes long enough. It's like riding a bike, if you don't want to fall down, well, don't ride. May not happen today, or even tomorrow, but you will eventually fall down, and get hurt.

Don't really care what it is, just not something I would do or recommend to be done by others. It's just not the right thing to do.
 

rusirius

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I never seen a good reason in stacking, even in vamos. It only gives you 6v max anyway. A single 18650 nearly always outperforms 2 x 18350s. Maybe in the mech world it could make sense.
Running them in parralel is a different story of course since you split the load and could draw a nice high amp but I rarely ever feelt the need to run in series for vaping.

Well... In THEORY there is a reason... sort of... :) While running two batteries in series won't increase your mAh, as pointed out it does double your voltage. Now as you said, any regulated mod will regulate the voltage anyway, so what's the point... Well... Remember ohm's law... Voltage can be "exchanged" for current and vice versa... So in other words, if we're running a fixed current and voltage OUT of the regulator, and we are supplying twice the voltage IN to the regulator, then our current will be cut in half... Think of it like this... If we are generating 5v out of our regulator and our battery is supplying and optimal 4.2v, then we have to regulate UP to 5v, meaning we increase the current to compensate... On the other hand, if we're generating that same 5v, but now our batteries are supplying 8.4v then we need to regulate DOWN to 5v, and the current (from the battery, not out of the regulator) gets reduced... So effectively even though it doesn't increase our mAh from the battery, it does in fact extend the battery life....

But here's the gotcha... If we had two 2600mAh 18350s stacked versus a single 2600mAh 18650 then yes, we're going to get much more life out of the stacked batteries... Close to double since the drain will be halved (only approximate due to inefficiencies).

But due to physical size, that just doesn't work out... You won't find a 2600 18350 IMR... In fact, let's say at best you find a 1300mAh... Even if that doubles your run time by halving your current you've still only equaled a single 18650...

So in the end.... Swamper and Greeny finally succumbed to the ways of Harold.... and in doing so each ...... wait... sorry.... try that again...

So in the end.... It really is pretty pointless and trying to keep cells matched, etc is just bunk when you can just slap an 18650 in there... :)
 

tj99959

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    Yes, the Vamo is designed for it, but even with that in mind... Do not mix and match battereis from different lots, manufacturers, or strings once put in use. And do not run the battery down to far before charging. It will just be better all the way around, not mention, I like my fingers just the way they are.

    There use to be a valid reason for stacking batteries, (it was the only choice we had) but those days are long gone.
    So my question is why would anyone even consider stacking when there are ways to get more power that work better, and are safer?
     
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