Z99 12V Portable Spot Welder Kit – 99-Step Control Board

Z99 12V Portable Spot Welder – Precision Power at Your Fingertips

The Z99 Portable Spot Welder Control Board is a compact, high-performance welding solution designed for DIY enthusiasts, battery pack builders, and electronics hobbyists. With 99-step power adjustment, a peak welding current of 1500A, and smart protection features, this kit delivers professional-grade spot welding in a portable 12V package. Made in Mainland China.

Key Features

• 99-Step Power Adjustment: Fine-tune welding intensity with real-time digital display of the selected power level for precise, repeatable results every time.
• 1500A Peak Welding Current: 5 onboard MOSFETs deliver a peak spot welding current of up to 1500A, capable of welding nickel strips from 0.1–0.3mm thick.
• Real-Time Voltage Monitoring: Built-in voltage protection displays 'UE' if the supply voltage falls outside the 8–17V safe operating range, keeping your build protected.
• MOSFET Temperature Protection: Automatic thermal monitoring displays 'CE' if MOSFET temperature exceeds 45°C, preventing overheating during extended sessions.
• High-Current Wiring: 10 AWG wiring paired with aluminium-oxidised copper spot welding pins ensures excellent current-carrying capacity and long-term durability.
• Pure Copper Conductors: Pure copper construction maximises electrical and thermal conductivity, boosting overall welding efficiency.
• Ultra-Low Standby Consumption: Standby power draw of less than 0.5mA — ideal for battery-powered setups.
• CE & RoHS Certified: Meets CE and RoHS compliance standards for safety and environmental responsibility.

Technical Specifications

Package Options

Choose the package that suits your needs:

• Package 1: Mainboard × 1
• Package 2: Mainboard × 1, Welding Pens × 2, Connection Cables × 2, Heat-Shrink Tubing × 2, Nickel Sheet × 1, Screws × 4
• Package 3: Housing × 1

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Learn more: OSHA on personal protective equipment

Frequently Asked Questions

Q: What type of battery is required to power the Z99 spot welder control board?

A: The Z99 spot welder requires a 12V supply from a 25Ah–60Ah battery or a high-rate battery rated at 30C or above. High-rate 18650 lithium battery packs are commonly used and recommended for optimal performance and peak current delivery.

Q: What is the maximum nickel strip thickness the Z99 can weld?

A: The Z99 is designed to weld nickel strips up to 0.3mm thick. The actual maximum weldable thickness depends on the battery's discharge rate — using a higher-rate battery will allow welding thicker nickel strips more effectively.

Q: What do the 'UE' and 'CE' error codes mean on the Z99 display?

A: 'UE' indicates that the input voltage has fallen outside the safe 8–17V operating range — check your battery connection and charge level. 'CE' indicates that the MOSFET temperature has exceeded 45°C — allow the board to cool down before resuming welding operations.

Q: Is the Z99 spot welder suitable for building 18650 lithium battery packs?

A: Yes, the Z99 is specifically designed for building and assembling 18650 lithium battery packs. Its 99-step adjustable power, high peak current, and precise control make it well-suited for connecting nickel strips between cells in DIY battery pack assembly projects.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.