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Thanks for the tag charon.

Hi scargill, lets see if we can't get this sorted.

Please excuse me if anything sounds patronising or you have already tried it, just trying to get all the info.

A couple of obvious things to start, you can't use protected batteries, please check yours is unprotected.
Minimum coil resistance is 1.2 Ohms, please verify yours is above this.

Are you using flat or button top batteries? The contact on flat top batts can become concave with use and fail to connect properly.
Have you tried a different battery?
Have you tried it in 18350 mode?
Have your tried different atty/head/coils?
When you look up inside the battery tube is the positive contact clean and free of swarf etc?
Does the spring in the bottom cap have a full range of movement?
Does it get used in humid environments, outdoors, bathroom, kitchen, etc?

That's cool testdruif, so 7A min is the constant current of the battery not the input current of the circuit.

Still, the rest of it is dangerous, you cannot make your own home made 2 cell Li-po and charge it from USB, that's called a time bomb.

Just to add some more aggro to the mix....

Your fuse Amps rating has to be BELOW the maximum safe current of the circuit to protect it, e.g. 7A circuit 6A fuse.
I have not been able to ascertain the safe maximum Amps for the DNA20?
The fuse voltage needs to be ABOVE the maximum voltage of the circuit so 16v or 30v is ok

Two fuses in parallel do not give double the rating of an individual fuse, if you double the rating and deduct 15% you should be close.
Based on the fact that the tutorial you are following shows Li-Po batteries wired in parallel and charged via USB I'm not convinced the author has done the proper Pre-arc or total current/time calculations.

The Evolve data sheet also specifies a single cell of above 7A but the tutorial seems to suggest multiple cells at 7A max and fused accordingly?

There seems to be much confusion as the whether the fuses are supposed to protect the Li-Po cell or the DNA20 circuit?

Super-Shiny, I hope for the future of vaping that somebody posted that pic as a joke?

Hello and welcome amygx.

Vapers of Vapour like to Vape Vapourisers. Enjoy Vaping

Good find Super-Shiny and vindication for the argument.

According to that table you can run 20 AWG throughout to no detriment, but if you already have both sizes then you can stick to the plan.

Hmm... Not sure on AWG or even SWG for that matter. I use thin wire for small stuff and fat wire for big stuff

If your wire is fat enough you can crush the tab and pinch it in there but you will always run the risk of galvanic corrosion.
I would personally reach for the flux, solder and a nice fat wire.

I just had another look at that pic and the Black wire is definitely soldered.

Tin the wire, crimp it into the tab and then pile on the solder sounds like the way ahead.