Function introduction: This circuit with 12V battery will become an energy storage spot welder for welding nickel plates such as lithium batteries and nickel-chromium batteries. According to different configurations, the welding thickness can be about 0.1MM-0.15mm. By replacing the thicker wire (10 square), it can barely weld 0.2MM thickness. After all, this device is geared towards electronics enthusiasts, and the frequency of use will not be very high, so it can also use 0.1-0.15 solder 2 to replace thicker nickel pieces. Key functions: The keys can switch modes, each mode corresponds to different welding time, LED corresponds to red / green / blue / white / yellow / pink / purple, 7 modes, the shortest red time and the largest purple welding time. Long press to set the waiting time. The default is 3 seconds and the maximum can be set to 10 seconds. Power supply voltage: 12V-16.8V (capacity X magnification = must be 150A) Current requirements: 150A or more instantaneous output (such as car startup power, 3S aeromodel high rate battery pack, 20A or higher and 12V lead-acid battery with good performance) colour:black Material:Composite material Package Contents: 1* soler board 1* 10m bonding pad 1 * bonding pad Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.