All true, I just like to error on the side of caution when throwing stuff out there that I know other people are going to build. Personally, I am
vaping a 30 watt 7 amp .6ohm dual coil on a mechanical
mod with no fuses or any protection other that what AW provides internally, so I get where you are coming from
I would be curious as to the current draw for the charging without the resistor though, I can't remember right now but I seem to recall it was going to be at least 1 amp possibly 2 amps peak. While an 18650 of any brand can easily handle that, if you were powering this box with say an old 350mA 12v power supply you had laying around you might run into the internal protection of that
device.
The reality is that there are probably 50 ways to build a welder now that we all understand the basic parameters of the design, a month ago that was not really the case because we had not collectively put our minds together. The design I outlined and put up the schematic and BOM for works perfectly, provided you don't start removing things or switching stuff around without understanding what does what. I got most of the parts for the second welder today and am planning on putting a step by step for it on instructables for the people who asked for it, if it is followed step by step it will give anyone a perfectly functioning machine for exactly $25 and less than 1 hour of work. There is nothing wrong with doing it a different way, just some folks like simple to follow directions without having to over think it
