More details on this Arduino port and general info on spot welding on LiPo cells.
Index for reference:
0:00 - Arduino port features
2:35 - Electrodes and variations
14:17 - LiPo Polyswitch (PTC not to be confused with the CID) and Cut-off circuit on commercial cells
19:12 - Spot Welding description
29:00 - Original STM8 MCU and different revisions

For more in depth information on the PTC and CID functionality you can refer to this NASAS-JSC presentation:
https://core.ac.uk/download/pdf/10556...
For instructions and code visit:
https://www.instructables.com/Arduino...