So it begins...... Battery spot welder

[sternwake]

The beeper had to go, it was far too useless, and obnoxious. 

Luca showed which trace to break to deactivate it.. 
Done and done.

I modified the black BSW acrylic enclosure to fit the Purple, and flowed a LOT more solder onto under and over  the brass bussbars on both sides of the Mosfets.

Here is a 50ms pukse, hakf power,  solidly welding 0.3mm of nickel to a razor blade with a 12.55v LIPO and freshly shined and rounded welding pen tips on a freshy cleaned razor blade. 

   

0.15 Copper aheet supposed to arrived monday.
If it can reliably weld that with a 0.1mm nickeled steel cap, at less than full power, ill be quite happy.

If it can't, then perhaps 10 matched infineon mosfets might be ordered, as well as a second lipo, and fatter welding leads..fabricated.

or.i can call 2 layers of nickel good enough, even though 4 would be required to match the resistance of the 0.15 copper.