1. The operating voltage range of the control board is DC2.5v-5.5v, and the battery can be replaced with 2 strings of 2.8v3000f capacitors. The modification of the Fara capacitor needs to solve the constant current charging problem by itself, and the USB port on the board cannot be used. 2. Unable to spot weld copper and aluminum 3. Adjustable 1-9 gears Instructions: 1. The contact surface between the nickel-plated belt and the battery should be clean, and the fit should be smooth, and the old battery should be polished and smooth 2. The following gear settings are for reference only (I found that the actual thickness of the 0.15 nickel-plated strip I purchased is 0.13-0.17) 0.1 nickel plating uses b1 file, 0.15 nickel plating uses b2 file, 0.1 b2 file for pure nickel and battery, b3 file for pure nickel and pure nickel You feel that the spot welding speed is too fast in the C gear, and you can't respond. If the spot welding intensity is not well controlled, increase the point, 3. Don't press hard, don't press hard, just gently fit the nickel tape and the battery 4. Wear the nickel tape to indicate that the nickel tape does not fit well with the battery, and there is a gap. There is no spark during spot welding under normal conditions, or very little, the sound is dull, If there are sparks in the spot welding and the sound is loud, the welding needle needs to be polished. Or the pressing force is too small or the battery and the nickel belt do not fit together, 5. After removing the solder pins after spot welding, wait for a silent count of four counts (1.1 seconds). Wait for the detection of the filter capacitor to discharge before proceeding to the next spot welding When the voltage drops to 3.5v, it needs to be charged, Do not touch the screw and copper on the solder pin at the same time with your hands. Otherwise, it may not be triggered (with sweaty hands),