FNIRSI SWM-20 Portable Spot Welder Double Pulse Battery Welding Machine 18650 Battery DIY Pack Welding Tool 0.4mm Nickel Chip

Azabooti presents the spot welder for on the go use, a portable welder designed for 18650 and 21700 packs. This 1200A double pulse welding machine delivers precise, reliable nickel welding with compact portability.

Unleash strong, reliable welds on the go with the FNIRSI SWM-20 Portable Spot Welder — your powerful, pocketable solution for building 18650/21700 battery packs and quick cell repairs.

Experience precision welding with the SWM-20’s dual-pulse technology and up to 1200A output, delivering clean, robust spots with minimal oxidation. The integrated 2.4-inch color display puts real-time parameters at your fingertips, while the precision encoder knob lets you dial in pre-heat, interval, and pulse width with surgical accuracy. This tool is designed for serious hobbyists and professionals who need dependable performance in a compact package.

Top features at a glance

• Advanced Double Pulse Technology for industrial-grade welds — pre-heat and main pulse work together to produce stable, strong spots and reduce sparking.
• 2.4" HD color display with a tactile encoder for intuitive parameter tuning — see pre-heat, interval, and pulse width in real time.
• Welding range from 0.1mm to 0.4mm with 4 preset combination levels and adjustable continuous spotting (1–9 dots).
• 2-in-1 design: powerful spot welder and 5000mAh USB-C power bank with 5V/2.1A charging for on-the-go devices.
• Ergonomic, compact form factor with safety features to prevent overheating during long sessions.

This tool is ideal for assembling battery packs, repairing nickel, iron, and stainless steel sheets, and performing meticulous spot welding work in tight spaces. Its 1200A max output ensures you get robust welds even on demanding packs, while the built-in power bank keeps you connected when you’re off the grid.

What you can expect in use

• Stable double-pulse welding for consistent results across varied pack configurations.
• Clear visual feedback from the display for precise control during long sessions.
• Portable, pocket-friendly design with a robust build for field repairs and workshop use.
• Safe operation with integrated cooling and overheating protection.

The SWM-20 is engineered for DIY enthusiasts and professionals who demand reliable performance without sacrificing mobility. Whether you’re building new battery packs for power tools, ebikes, or portable electronics, you’ll appreciate the compact form factor, ease of use, and dependable weld quality this device delivers.

Care and maintenance

• Keep contacts clean and free of oxidation for best welding performance.
• Follow safe charging practices for the built-in battery; use only the supplied or compatible 5V/2.1A charger.
• Avoid prolonged continuous welding on high settings; allow cooling periods as needed.
• Store in a dry, ventilated area away from moisture and extreme temperatures.

Features

• Enable portable welding with double pulse precision
• Dial pre-heat and pulse width for stable spots
• View real time settings on 2.4" display
• Welds 0.1–0.4mm nickel with minimal oxidation
• Supports 18650 21700 battery pack creation
• Compact tool for battery pack repair on the go
• USB C power input for versatile charging

Specifications

• Materials: nickel, iron, stainless steel

Frequently Asked Questions

What kind of batteries can this welder handle?

It is designed for 18650 and 21700 cells and nickel strip welding. Use the double pulse to achieve strong spots with minimal heat damage. Always follow safety guidelines and electrode recommendations.

Does it require special power or accessories?

The SWM-20 supports USB C power and typical high current adapters. Ensure your power source meets the device's current needs and use appropriate nickel strips and connectors for best results.

Is this suitable for DIY battery pack projects?

Yes, the FNIRSI SWM-20 is built for DIY battery pack assembly and repairs. It offers precision control, real time parameter readouts, and compact portability for field work.