The circuit is a 12V spot welder suitable for connecting 18650 Li-Ion batteries to nickel-plated steel stip by spot welding
The circuit is suitable for spot welding of 0.1...0.15mm nickel-plated steel stips

Power supply: minimum 20...90 Ah gel or lead-acid battery
Power supply: 3.5...5.5 Ah 45C 3S lithium battery

Operating voltage 11.1...14.6V DC
Current consumption: 90...150A

Button functions (mode indicator LED):
1th button press: red light (minimum power)
2nd button press: green light
33d button press: blue light
4th button press: white light
5th button press: yellow light
6th button press: pink light
7th button press: purple light (maximum power)

Green flashes indicate impulse transmissions (working indicator LED)