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NEVER EVER EVER will I make a dual coil version...
Dual Coils are DANGEROUS beyond all belief, and even DC cartos a disaster waiting to happen.
I feel this is one area of safety has has not been adequately addressed, and in many ways I believe it may be the root cause of the increasing number of battery explosion accidents.
I have seen posts about Battery Safety and Tube Mod safety, but a large contributing factor which will rapidly compound the issue is "Load" safety.
A Little history which helps to demonstrate my point:
A little over 15 months ago, the introduction of Low Resistance cartomizers and atomizers occurred, and with that introduction, eCigs became a LOT less safe. Suddenly the old reliable eGos and 510s started experiencing failures that were not common before the intoduction of lower resistance loads... the PVs failed because the load was too great, causing the circuitry in these PVs to fail. These failures protected the users, in many cases, against their will.
The reason for the failure is because the Load Resistance dictates how much current will be delivered to atomizer/cartomizer.
This has driven many eCig users away from electronic and regulated eCigs into the realm of mechanical Mods with batteries that will deliver the current needed to utilize these lower resistance loads. As we all know, a single battery PV with an LR load is relatively safe, but the quest for higher performance has led us down a path into areas that are far more disconcerting.
A little less than a year ago, Dual Coil cartomizers appeared on the scene and with them, an entirely new series of safety issues. These loads not ONLY have a low resistance, but they have the capacity to sink a HUGE amount of current into them without failing. This is because each coil of the load has the capacity to handle DOUBLE the voltage, or more, than a single coil of the same aggregate resistance. In other words, a 1.5 Ohm single coil carto handles far less power than a 1.5 Ohm Dual coil, due to the dual coil have TWO 3 Ohm coils in parallel....
To a battery with a low current delivery capability, A Dual Coil Carto represents a HOSTILE load, attempting to pull far more current from the battery than it can safely deliver.
These new cartomizers have taken the vaping community by a storm. Suddenly, the Good Old Standard, the ProVari is sending error messages to it's users, and they have demanded a Higher Current delivery version... The PV is PROTECTING itself from this hostile load, and the end users are saying "NO WAY... I need more current"
This has driven even MORE members of the vaping community to the realm of mechanical PVs, but now with stacked batteries because these Cartomizers perform better at these higher voltages...
And the most likely battery to stack in a metal tube designed for an 18650?
Yep... the readilly available, and potentially lethal 16340 (Aka CR123a). Unfortunately there are a variety of Low C versions of these batteries on the market at bargain basement prices.
I believe that we have only seen the tip of the iceberg with this issue, and the warnings issued that I have seen have fail to mention that a battery, in all likelihood WILL NOT fail unless there is a load attached to it, and the size of that load can really matter.
I believe that the proliferation of Dual coil, and now Triple coil cartos is the tipping point that is going to set off an epidemic of these devastating failures. As the size of the load increases, the danger increases exponentially! The same is true for dual coils in a Genesis Atty
It's true that cheap batteries stacked in an unvented PV is a recipe for disaster... but the risk increases by a huge margin once the hostile load of a dual coil load is introduced to the equation.
It's true that single cell and High C batteries are much safer... but the introduction of a second coil is flirting with disaster.