12V DIY Portable Spot Welding Machine Battery Storage PCB Circuit Board Welding Device Spot Welders for 18650 26650

Features:
There is a window on the back of the drive part, you can add copper or tin by yourself.
The external pads for the LED and the on-board buttons are added to facilitate the connection of the LEDs and buttons on the board to other places.
The upper and lower MOS design is bold and tinned to make the internal resistance smaller and the current stronger.
Using 25V low internal resistance and high frequency capacitors makes the power supplies more stable.
This circuit with a 12-V battery will become an energy storage spot welding machine for welding nickel pieces such as lithium batteries and nickel-chromium batteries. According to different configurations, the thickness can be about 0.1mm-0.15mm