Mmmmm, that also is subjective, but let us take the OP, 220watt dual battery mod using 20amp CDR rated but 18amp independent tested batteries.
Dual, triple core fused claptons with 24awg cores wrapped with 30awg outer, technically a sextuple coil setup. Now what if the user is needing to push those coils at 180plus watts, even though the resistance is at say 0.1ohm which the mod will fire.
(180watts/6.4v low battery cut off being a series config)/90% chipset efficiency=31.25amps <--- there would be the instance of an unsafe build in a regulated mod if it would not error out saying not enough push from the batteries.
Can and has this type of danger occurred, yes
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Still not dangerous. Battery will cut off just the same. For 180w on a regulated mod you need at least 2 cells for 40A total, The low battery cut off is to prevent over discharging which can damage the batteries, and still well above the level that could cause a thermal run. We already know the OP is using the recommended brand name batteries suitable for his mod. The only real issue comes from chain vaping at 200w where the atomizer heats up and that transfers to the mod. High temp can ruin the IC circuits at which point the mod just will not fire. The only real issue is when the protection circuit fails but even then, with proper batteries, it is most likely to just ruin the mod. I've been vaping about 9 months, Member of 3 forums, 2 actively (daily) and in that time I have seen only 1 regulated mod fail. The cause is unknown but we figured it was either the 510 pin broke and dropped inside the mod causing a hard short or the protection circuit failed and let the power fire continuously without cutting off at 10 seconds. The batteries were Samsung 25r and they vented out. Ruined the mod but didn't explode in the persons pocket. Now nothing in the guys build had anything to do with the mod failing.
200w at 8.4v is only 24 amps. Safe even on 2x 20amp batteries. Even safer on 25rs.
Since you pretty much ignore resistance since the mod won't fire below 0.1 ohm
Even at 6.4v (which is raised by the mod to 8.4) you still only draw 31A spread across 2 batteries.
Now if you were talking about a dual cell mech mod, then yes, you would be 100% correct. However, a dual cell mech mod is an advanced vaping device, so the user would be aware of the safe limits and how hard he could push the batteries.
Now just for example, my mod is at 50% charge so it only allows me to go up to 159w.out of 200w total. (34 ohm build)
Now if anyone DOES find a regulated mod that acts the way you suggested, let us know and we can avoid it. That isn't a coil issue, it is a design issue with the mod.
Now just so you don't think Im new to vaping and don't know what I am talking about...
I do competition builds on a single cell mechanical mod. So I pull 220 to 240W on some builds. Mind you, I only get 4 to 6 pulls per battery charge and have to recharge at 3.9V, but I know my batteries can handle it and how long they can handle it for.
Little note here.. unless you are using proper brand name high drain batteries and know what the stress test results are and how long you can fire the cell for and a dozen other little bits of info, don't do this.
I won't say it is "Safe" but it is as safe as anything else. If you know what you are doing, you cut the risks.
The main issue with a regulated mod isn't actually the amount of watts you fire at, the main issue is making sure you use good batteries and they are in good condition (no tears in the wrap)