12V DIY Portable Spot Welding Machine PCB Circuit Board For Li-ion and LiFePO4 Batteries – Pre-Assembled Type 3: 4MOS

DIY Portable 12 Volt Battery Energy Storage Spot Welding PCB Circuit Board

The 12V DIY Portable Spot Welding Machine PCB Circuit Board includes an electronic welding module that is the heart of the build. Spot welding works on the principle of rapid local heating and cooling by high current — turning this board into an energy-storage spot welding machine for welding nickel pieces such as lithium batteries and nickel-chromium batteries. It is practical, easy to operate and use, has a wide application range, and offers a long service life.

Features

• Lightweight and portable, stable and reliable, wear-resistant, providing long service time.
• There is a window on the back of the drive part — you can add copper or tin yourself for higher current handling.
• External pads for the LED and onboard buttons are added, to facilitate connecting the LEDs and buttons on the board to other places.
• Suitable for welding 18650 / 26650 / 32650 batteries.
• Pre-soldered and fully assembled — no build or SMD work required.

How the 12V DIY Portable Spot Welding Machine PCB Works

The board stores energy from your 12V battery source and releases it as a short, high-current pulse through the welding probes. This concentrated pulse fuses the nickel strip to the battery terminal in a fraction of a second, creating a strong, low-resistance joint without overheating the cell. Because the heat is applied locally and briefly, the internal chemistry of Li-ion and LiFePO4 cells stays protected — which is why spot welding is preferred over soldering for battery pack assembly.

How to Use

1. Connect a high-current 12V battery source (see note below) to the board input terminals.
2. Attach the welding pen / probes to the output pads.
3. Place a nickel strip over the battery terminal.
4. Press the probes onto the strip and trigger the pulse using the onboard or external button.
5. Inspect the weld and repeat for a second spot to ensure a strong bond.

Typical Applications

• DIY 18650 / 21700 / LiFePO4 battery pack assembly
• Battery pack repair and rebuilding
• Nickel strip and tab welding
• Hobbyist, robotics and prototyping battery projects

Power Source Note

We recommend using a high-current battery source of 160Ah+ with this module, as all spot welding machines need a high current for welding. A high-CCA lead-acid battery or a high-discharge lithium pack works best. Insufficient current will produce weak welds that peel off easily.

Safety Tips

• Always wear eye protection — spot welding produces sparks.
• Never short the output probes together directly.
• Work in a dry area and keep flammable materials away from the welding zone.

Package Includes

• 1 x 12V DIY Portable Spot Welding Machine PCB Circuit Board for Li-ion and LiFePO4 batteries

Frequently Asked Questions

Does the 12V DIY Portable Spot Welding Machine PCB come assembled?
Yes — it ships pre-soldered and fully assembled, ready to connect to a battery and welding pen.

What battery can I use to power it?
A 12V source rated 160Ah+ (high-CCA lead-acid or high-discharge lithium) gives the strongest welds.

Which cells can it weld?
18650, 26650 and 32650 lithium cells, plus other Li-ion and LiFePO4 formats using nickel strip.

Note: Circuit design and colour may vary from images. This item comes pre-soldered and assembled.