GX591 DIY Spot Welder 99-Gear Control Board for 18650 Battery
GX591 DIY Spot Welder 99-Gear Control Board for 18650 Battery
GX591 DIY Lithium Battery Spot Welder — 99-Gear Adjustable Control Board
Take your battery pack building to the next level with the GX591 Spot Welder Control Board. Engineered for hobbyists, makers, and electronics enthusiasts, this compact yet powerful 12V mainboard delivers precise, repeatable welds on nickel strips as thin as 0.1–0.2mm — perfect for assembling or repairing 18650 lithium battery packs, RC model batteries, and more. Made in Mainland China.
Key Features
- High-Speed Single-Chip Design: Intelligent microcontroller delivers consistent, accurate spot welds every time, with real-time battery voltage monitoring displayed at a glance.
- 6× MOS Tube Technology: Six high-performance MOS tubes enable peak welding currents of up to 2,400A, producing strong, reliable welds on nickel sheets ranging from 0.1mm to 0.2mm thick.
- 99 Adjustable Power Levels: Dial in the exact output you need across 99 precision gear settings — ideal for continuous high-volume welding without sacrificing accuracy or weld quality.
- 3-Digit Digital Display: The bright digital tube display shows the current gear level and live power-supply voltage, alternating between the two when idle for at-a-glance feedback.
- Automatic Trigger Welding: The auto-trigger function initiates the weld the moment the welding pen makes contact, streamlining your workflow and improving consistency across thousands of welds.
- Flexible, Durable Welding Pen: Built with 12AWG multi-strand high-temperature wire for excellent twist resistance. The thick pure-copper welding pen body and aluminum-copper needle handle high currents with ease and last through extended use.
- Broad Power Source Compatibility: Works with lead-acid batteries, LiPo model packs (3S), car jump-start supplies, and custom assembled battery packs (8–24V operating range).
Technical Specifications
| Model | GX591 Welding Machine Control Board |
| Working Voltage | 8–24V |
| Working Current | < 20mA |
| Peak Welding Current | Up to 2,400A |
| Standby Power Consumption | < 0.5mA |
| Welding Thickness | 0.1–0.2mm Nickel Sheet |
| Max Operating Temperature | 175°C |
| MOS Tubes | 6 × High-Performance MOS |
| Board Material | Printed Circuit Board (PCB) |
| Board Dimensions | 89 × 54mm (3.50 × 2.13 in) |
| Weight | 180g |
| Country of Origin | Made in China |
Compatible Power Sources
- Lead-Acid Battery: 2 × 20Ah electric vehicle battery; 36–40Ah new car starting battery
- LiPo Model Battery: 3S 4000mAh 35C / 3S 5000mAh 25C / 3S 8000mAh 20C
- Car Jump-Start Supply: 11.5–14.8V, 36–60Ah (internal resistance 2.5–7 milliohms)
- Custom Battery Pack: 11.5–14.8V, total internal resistance <7 milliohms
Package Contents
- 1 × GX591 Spot Welding Machine Control Board
Note: Due to monitor calibration and lighting conditions, actual colors may vary slightly from photos. Please allow ±1–2cm measurement tolerance due to manual measurement.
For general electrical safety guidelines when working with high-current tools and electronics, visit OSHA Electrical Safety.
Frequently Asked Questions
Q: What battery types are compatible with the GX591 spot welder control board?
A: The GX591 supports a wide range of power sources operating between 8–24V, including lead-acid car/EV batteries, 3S LiPo model batteries, car jump-start power supplies (11.5–14.8V, 36–60Ah), and custom-assembled battery packs — provided the total internal resistance is under 7 milliohms.
Q: What nickel strip thickness can the GX591 weld?
A: The GX591 is designed to weld nickel sheets in the 0.1mm to 0.2mm thickness range, making it well-suited for assembling 18650 lithium battery packs and similar DIY battery projects.
Q: How do the 99 power gear levels work?
A: The control board allows you to adjust the welding power output across 99 distinct levels via the onboard controls. The current gear and live battery voltage are shown on the 3-digit digital display, so you can fine-tune your settings for consistent, high-quality welds across different nickel strip thicknesses and battery configurations.
Q: Is the automatic trigger feature adjustable?
A: Yes — the auto-trigger function initiates a weld the moment the welding pen tip makes contact with the workpiece. This hands-free triggering mechanism improves weld consistency and speeds up repetitive battery spot welding tasks significantly.
Q: Is a 18650 battery or charger included in the package?
A: No. The package includes only the GX591 Welding Machine Control Board. You will need to supply your own compatible power source (see the Compatible Power Sources section above) to operate the welder.