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I check out a couple of low cost portable spot welders now on the market, are they any good?

Self contained spot welder with 5Ah LiPo cell:
https://www.aliexpress.com/item/10050...
Just realized it's no longer available but here is an alternate seller:
https://www.aliexpress.com/item/10050...

5MOS Purple PCB Spot welder with plexiglass cover DIY:
https://www.aliexpress.com/item/10050...