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?This machine is equipped with 3.7V, 5.5AH lithium battery. After the single-chip microcomputer detects that the soldering pen touches the nickel sheet, it controls the “MOS” to turn on. Since the resistance of the soldering pen contacting the nickel sheet is much greater than that of other parts of the loop, most of the energy is concentrated here. The way of heating, the nickel sheet is melted, and the nickel sheet is welded to the battery.
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