Charging leisure battery from portable solar panels

@Sackmycook and @Dellmassive (or anyone else), I've come across my first hurdle. I've cut the solar extension cable (the one mentioned by @Sackmycook above, only to discover it has a single core with a sheath. I was expecting 2 cables to connect to the + and - of the MPPT controller. Any advise please? MTIA.
 
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