Self-balancing Spot Welding Pen

I have replaced the original spot welder pen with this Self-balancing Spot Welding Pen.

Previous review video: https://youtu.be/2jxcZHzowS8
Tear Down this spot welder video: https://youtu.be/9S0cc9X4s_4
Adjustable battery holder: https://youtu.be/FDA-37d6ag4
Disc sander in this video: https://youtu.be/siY9MFk650w

You can buy this handle on Aliexpress: http://s.click.aliexpress.com/e/_sYflDH or http://s.click.aliexpress.com/e/_sOXaAL

You can consult some items:
SUNKKO 737G Battery Spot welder 1.5kw http://s.click.aliexpress.com/e/_cmg2sx
Spot welder DIY assembly kit if you want to DIY yourself a transformer
http://s.click.aliexpress.com/e/_c3tYN9
Nickel strips: http://s.click.aliexpress.com/e/_coB8Wr

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Видео Self-balancing Spot Welding Pen канала GooDiY