I test out 4 PCB spot welders. its clear that the cheaper spot welders simply do not deliver the current necessary to properly spot weld batteries.
see the finale of this series here
https://youtu.be/oIDYV20cKrM
Link to the winner! They sell out so i have provided multiple links!
https://www.banggood.com/custlink/DmmYOtE5yd
https://www.banggood.com/custlink/GmDdLVhtEc
https://s.click.aliexpress.com/e/_AcpEUf
https://s.click.aliexpress.com/e/_AOvbd5
https://s.click.aliexpress.com/e/_AphP7t
Link to 80C battery
https://amzn.to/3cOIADl
Link to 75C battery on Banggood
https://www.banggood.com/custlink/3G3yLcSeH3
Link to Mosfet Coolers
https://amzn.to/3t2zV5X
Tools i use
ISDT 8S battery Monitor
https://amzn.to/3kwiqY5
ToolkitRC 8S charger
https://amzn.to/3dSxMon
icharger X8
https://amzn.to/3pXGAfa
Bench Power Supply
https://amzn.to/3sETf8n