d.)
Combination of board A and Board B (with direction, positioning the arrows of the two boards are as
shown below) after the two positioning arrows are aligned, solder the two boards together with a
soldering iron
i.)
Align the two positioning arrows first
ii.)
Solder the two boards with tin wire
iii.)
The positioning arrows of board A and board B are shown in the enlarged picture on the upper left
e.)
Combination of the battery box and Board C
i.)
Pass the battery box wire out of the bottom of board C according to the corresponding polarity
ii.)
Reserve a certain length of wire, cut off the excess wire
iii.)
Solder the battery box wire -- ma red, - black
iv.)
Combine the battery box with screws and nuts
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