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It's a ground connection, I still have no doubt, just need to find out which one, and since it seems to run fine with the battery under the 510, that narrows down which side is the problem.

If you look at Robby's tear-down picture, you'll see two screws attached to the chassis on the upper left and upper right of this picture.  Those are your most likely culprits, along with the battery caps and threading there.

That all depends on you mate.  Myself, I go through a single 18650 in about 3 hours on my regulated mods, and get about 5-6 hours out of a dual parallel 18650 mod, and I don't expect much more than that out of the VF running Kanthal.   But that's just my low ohm, lung hitting chain vaping 10ml+ per day habit, your mileage may vary.

As a bit of a bonus, with TC active, you'll tend to get a bit better battery life just because it's modulating power down quite often.

Dunno, sounds about as buggy as the DNA40 to me.  I think it's cloned too well.

Unfortunately, DNA40 pre-heat only works with Ni200 builds. In regular Kanthal mode, it's just the same as a DNA30. The SX350 has an advantage there, and for normal wire builds, it's overall just a better board solution than the DNA40 IMHO, with accuracy on par with a DNA board, a wider power range, more options, a better display (in the full size board), and the firmware can be updated by the end-user, no small thing. Its biggest failing is a large board footprint, and they partially addressed that with the SX 350 Mini board, at the cost of a smaller display.

I expect the SX350J will maintain that superiority whilst adding temperature control, and from what I've seen, the end-user is still going to be picking a temperature, not some other unit of measure. How the board itself calculates temperature may differ from Evolv's simple resistance delta method, as it seems it's not only going to be reading resistance changes but actual power input as well. Knowing both how much power it's fed the coil over a period of time combined with monitoring the resistance change, it has the potential to more accurately determine temperature, and almost as important, give better/smoother control to the process. Note I said potential, how the finished product actually works is just conjecture at this point.

But a watt is just a measure of joules per second.  I reckon it's a French conspiracy, since Amps, Volts, and the Metric system all come from them.  Waiting for the mods to start measuring Coulombs next.  

Yep:




I quite like it for its simplicity.  Doesn't look like it has stepdown, when the presenter fires that 0.7 build at 8 watts, it's probably more like 20w/battery voltage.