You should definitely add balancers, just like for a Lipo battery. These ultracaps are similarly delicate, never charge them beyond their rated voltage. When you want to use with them with kWeld, use a bench supply to ramp up voltage (starting with 4V), until you get enough current during calibration (1500A is the sweet spot, 2000A maximum). Putting them in parallel with a 3S may easily cause overcurrent.
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In my understanding, KWeld is discharge energy based welder, it does not need 2 pulses and welds will be more consistent, as they do not depend much on contact and time consistency, every weld receives same amount of energy, time is the variable. Time fixed welds can vary from one to other because of current path inconsistencies, caused by varying pressure on the tab, distance of electrodes, cleanliness of the weld patch, some of those issues are fixed with 2 pulses, where 1st is to clean and clear the path, but there is no guaranty that every weld receives same amount of energy at the end. welderreview. com
This happens on all manual welders.
We all have clean nickel, and clean cells, maybe some sweat from hands and a bit of maybe “grease” but that should evaporates really easily.
Also that website has listed sunkko welder for a top spot welder, and since then their credibility in my eyes has dropped to 0
Basically you wont find a better welder than kweld for our needs, that is that cheap, small, avalible and easy to set up and use.
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You’re talking to a SEO dummy account. He just leaves url breadcrumbs for his affiliate sales “review” site 
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Should have seen that earlier…
Basically the whole website is a copy past of amazon articles description and reviews combined…
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Considering that I only use 1 of those packs and have the welder detect the internal resistance as a little too low than what’s recommended, I’m not at all surprised that it did not like your 3 packs in parallel 
What readings did you get on calibration?
1980A, the calibration failed
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Alright, @BillGordon and i are gonna share a welder and finally start building our first battery packs.
From what i’ve read from the thread, dual lipos seem to be the better option for powering the welder.
So besides from the welder, and lipos, what else should we get? And if any recommendations on sites to get them from, that’ll be great.
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How thick strips are you welding with? Single lipo has been good to me with 0.15 strips. Capacity is a bit lacking, had to charge it up again to finish a 10s5p pack to the end, but hey, I don’t mind taking a 1h break.
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Probably gonna be 0.2mm nickel
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2nd lipo is probably worth it then, considering you’re splitting the price. (Just for capacity reasons alone)
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Anyone know where I can get one of these? Budget is 2k
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1 good lipo is enough Linny. 2 can be better but the welds are just as good. Get extra tips.
You want an enclosure. Print it using the stl they provide, or buy the laser cut plexiglass enclosure from them. Don’t run it open, that’s asking for fireworks.
Also need a balance charger for the lipo.
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Ok, I’ll probably grab the lipo and balance charger from Hobbyking, any type to go for? 2s? 3s?
Also, yea I printed it before I went to bed last night after making the welder order
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Graphene 3s 75c 6000mah
Those green ones.
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I bought these, since a few kwelders seem to like them, but that one @370HSSV has seems pretty good too
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