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Spot Welder for battery homemade DIY part 1, Punktschweißgerät

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Easy to build DIY spot welder (Punktschweißgerät) for under 60$.
Works great und safes a lot of time. Better than microwave welders.
High temperature destroys lithium batteries, so soldering is no option.
I want to build a 700Wh battery pack for my electric homemade boat and E-bike using 60 panasonic ncr18650b lithium batteries.
Spot welding machine Part I

Spot Welder Part II:
https://www.youtube.com/watch?v=o6OafhgeK_U

Part III Finished Pack + Monitor App
https://youtu.be/vaHyQGw8j3U

lifetime test NCR18650B:
https://www.youtube.com/watch?v=GLaeZ32cB6E

How to build a Li-Ion battery pack Part:
https://www.youtube.com/watch?v=nqxY-899Rb8
https://www.youtube.com/watch?v=-xXxFsooSdI
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