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batteries (black cable is negative and it shall connect with right side, the red positive
connecting to left side.)
Diagrammatic sketch:
The above sketch is shown by a 4-cell and a 2-cell batteries connected in two ports. Also
you can connect a 6-cell battery in one port, or 3 pcs 2-cell in different port, or 2pcs 3-cell
batteries to different port. Shown by sketch below:
（1）connect with 3pcs 2-cell batteries：
（2）connect with one 6-cell battery：
Red cable（positive）
always on the left
Black cable（negative）
always on the right
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