Stacking matched 18350's in a mechanical mod with high resistance coil builds ( >= 1.5 ohm)

[jersey_emt]

I know that high voltage, high power regulated mods are all the rage right now. But before I invest $100 or most likely even more on one, I want to see if I would enjoy this type of vaping first.

I just bought four new purple Efest 18350 batteries (700 mAh 10.5A). I already have two that I use with 0.8 - 1.0 ohm builds on my mechanical mods when I want something smaller to carry around, and they have worked great in that regard.

I haven't used any of the new batteries yet, but I am thinking of setting aside and marking two of them, to used stacked in a mechanical mod, with a 1.5 - 2.0 ohm coil. These batteries would solely be used together and charged together for this, so that they remain balanced.

With a 2.0 ohm coil, two stacked 18350's give 8.4 V fully charged, working out to 35 watts and only 4.2 amps. A 1.5 ohm coil produces 47 watts and pulls 5.6 amps.

I know stacking batteries can be dangerous, but it is my understanding that as long as you use only matched pairs like I plan to use, and staying well within the safe discharge limits of the batteries (by using high resistance coils), things should be good.

I'd just like some additional input before I attempt this -- am I missing something important that would make my plans dangerous?

 

[jersey_emt]

Does anyone have some information regarding this? I think it should be safe at the resistances I am planning (1.8 - 2.0 ohms likely, but no lower than 1.5 ohms) if I used matched pairs of 18350 batteries (a pair always goes in together, always charges together, and always verifying that they are both at the same voltage when put on the charger to check for unbalanced discharge). Should I use a multimeter to check the voltages of each battery in the pair before they go on the charger, or will the voltage display on the charger suffice (Efest LUC V4, voltages of batteries charging are displayed to the nearest 0.1 volt)?

 

[PaulBHC]

JeremyR uses stacked in a Sigelei Zmax but that is a regulated mod. You might PM him.

 

[Flavored]

That'll work fine, your math is correct. Stacking batteries is only an issue if you don't know what you're doing, and you clearly do. Folks who try to put 8.4 V in a regulated mod rated for a 4.2 are the ones with problems.

 

[1mouse3]

28g 14-15 rap 2.2-2.3Ω 2mm or 30g 13-14 rap 3-3.3Ω 2mm, would be 2 good coils to try that would have you in an ideal heat range of 200-250 mW/mm heat flux. any higher could start giving you a burnt taste (depends on the type wick) and any lower will start slowing down your heat up time