Colors don't really matter. I have some that are all black, some that are all red, some have one black and four reds, some have four blacks and one red.OK, well why 2 red and 2 black? Balance leads with 4 wires ha e 3 positives and 1 negative. This lead appears to have 2+ and 2-. Why is this?
Here is a picture of one of my 3s lipos.