mine only had the black cable and the small wifi card was slightly different. the card itself has two available connections and is labeled as to where the black cable (main) and white cable if it were present (aux) cables connect.
the battery is a cr2032. Its one of the most common battery sizes available just about anywhere from a grocery store to amazon.
there is one more screw that must be removed at the bottom right corner of the motherboard, just out of view.
this spacer may be a cd rom drive or potentially a second storage device like an ssd or hard drive. Either way the process is the same, remove the single screw, and slide to the right.
correct, swap the green and red