The 73B is a precision spot welding pen designed for use with Sunkko welding machines. It provides accurate control and stable performance for welding thin metal strips and battery packs.
Copper tips for efficient current transfer
Easy to handle for precise welding
High-current silicone cable for durability
Ensures consistent welds
Easy plug-in connection with main welding machine
Built for industrial use and long-term reliability
Welding nickel strips on 18650 / 21700 cells
Rebuilding and repairing battery packs
Small metal welding tasks
Hobbyist and professional battery pack assembly
Used in EV packs, power tools, and industrial battery packs
| Voltage Range | 3V – 6V DC |
| Charge Current | 25A constant current |
| Discharge Current | 2000–2500A peak |
| Channels | 1 |
| Accuracy | ±1% pulse duration |
| Display | None (controlled via main spot welder) |
| Dimensions | 130 × 40 × 25 mm |
| Weight | Approx. 0.45 kg |
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