Portable DIY Mini Spot Welder 3.7-4.2V Welding Machine Multipurpose Welder Welding Equipment Practical Tool Kit Description: brand new and high quality Features: The spot welder is equipped with a 3.7-4.2V 8000mA lithium battery with a discharge rate of up to 70C and an output capacity of about 300A. Through the MOS tube output, the energy is concentrated at the end of the soldering pen through a short-circuit heating method. Within a few milliseconds, the nickel sheet firmly fuses the battery together and is precisely controlled by a single-chip program without triggering a switch. With a charging control module, the module charges the battery through the USB port and charges hundreds of solder joints on the commonly used nickel-plated board in the range of 0.1mm-0.15mm. Installation method: Weld the buzzer according to the plan (distinguish between positive and negative) Solder the negative wire to the negative output terminal (if you don'for t have a high-power soldering iron, you can adjust the temperature by heating the soldering iron) Use screws to fix the battery on the back of the circuit and the copper ears of the output wire (distinguish the positive and negative poles, and be careful not to short-circuit the copper foil and the circuit board components) Fully charged after assembly Specification: Type: Spot Welding Tool Material: Metal + Plastic Features: Spot Welding Tool, Mini Portable Welder, DIY Welder Machine, Welding Equipment Tool Kit Dimension: app.14.1x5cm/5.55x1.97in Color: As picture show Quantity: 1 Set Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Set x Spot Welding Tool