After buying a few fake 1F caps on ebay (a couple useless ultracaps stuffed into a huge can with concrete weight in it), I ended up buying name brand 1F car audio caps from at least 10years ago mfg date, and finally I got caps with welding useful ESR.
That said, a person needs a capacitive welder about as much as you need sand in your eyes. You will be very likely to make damaged cell sketchyness, and if finding caps seems hard it's improbable welding with them will do more than make e-waste.
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