Attention!
- Power the spot welder with a battery with a maximum capacity of 45Ah, otherwise the MOSFETs may be destroyed due to current overload!
- Be sure to place the shrink tubes on the stem of the contacts! Never use the contacts without insulation!
- The module may be destroyed if the 2200uF capacitor is soldered in incorrectly or if it is powered above 14.6V!
- It is recommended to use a new 30-45Ah lead-acid battery. Obsolete or replaced old batteries usually do not meet the load requirements.

The circuit is a 12V spot welder, which is suitable for connecting 18650 Li-Ion batteries with a nickel-coated steel plate to each other by spot welding.
The circuit is suitable for spot welding 0.1...0.15 mm plates.

Power supply: 12V DC - 30...45Ah lead-acid battery
or 12V DC 3.5...5.5 Ah 45C 3S lithium battery

Operating voltage 12...14.6V DC
Current consumption: 90...150A

Use:
- Pressing the button for a long time turns on the module, it beeps once, the LED lights up. This is the weakest grade 1. In this state, the module discharges (welds) every 1 second by placing the two contacts close to each other and perpendicular to the surface to be welded.
- You can choose from 5 strength levels, you can go to the next level by pressing the button for a long time.
- When entering the next stage, the same number of beeps and LED flashes indicate the number of the given stage.
- In the 5th stage, pressing the button for a long time turns off the module.

Attention!

- Power the spot welder with a battery with a maximum capacity of 45Ah, otherwise the MOSFETs may be destroyed due to current overload!

- Be sure to place the shrink tubes on the stem of the contacts! Never use the contacts without insulation!

- The module may be destroyed if the 2200uF capacitor is soldered in incorrectly or if it is powered above 14.6V!

- It is recommended to use a new 30-45Ah lead-acid battery. Obsolete or replaced old batteries usually do not meet the load requirements.