I've got a 12V powerbank that I would like to use with a 12v device. The power bank output and the device both require 5.5 x 2.1mm male plugs.
I've actually got some random cables and have found two of these exact cables. Now for the weird thing, when I test for continuity with a multimeter, it is different for these cables - so for one cable, I get continuity when I use the two outside surfaces of both the 5.5mm ends. However, on the other cable, I get continuity when I use the outside surface of one end and the inside surface of the other end. Does this not matter for a DC circuit? So if I randomly join together two cables with 5.5mm ends, then I don't need to worry how it is joined or should I make sure the continuity is inside part to inside part and outside with outside?