12V Spot Welder DIY Kit 100 Gear Spots Welding Control Board for 18650 Battery
Support 0.1-0.15MM nickel spot welding. Lead-acid battery: 12V battery car battery 20AH 2 (new). If P1 can be soldered, do not switch to P2 mode. It is easy to burn the motherboard in P2 mode but still can't solder, you can try P3 mode.