I have been reading up and researching how to connect 18650 cells in parallel and series. I understand how to do this in square or rectangular designs, but I don't know how it works in non square or rectangular designs. I am wanting to build my own dolphine case for my ebike and saw the cell configuration and I am not sure how to connect the five cells with the RED square around them in the attached picture? Is there a good resource to learn how to connect non square or rectangular battery packs?