Personally, I'd have put it in electrical.
You can probably contact FIRST and get it replaced using the usual KOP errors and omissions system.
I can't help wondering how many more of these are out there
, potentially in the hands of rookies who could inadvertently make a "death battery" (where the red that should be black is connected to the positive pole of the battery, resulting in the unfortunate release of magic smoke from some rather expensive components when it gets innocently connected to a properly wired robot).