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Your picture can't be viewed, but I would connect 4 pins on the JST to 4 pin Mini Fit Jr to connect to the 160XT. I would not call them "molex" because molex is the name of the company that designed them. "Molex" is used colloquially for this particularly type of connectors:



The 4 pin you're talking about is called Mini Fit Jr:



What you need, instead of 4pin Mini Din to Mini Fit JR adapter above, you need the 6pin JST to 4 pin Mini Fit. 4 wire should be connected. I recommend you use 18AWG for the 4 wires.