That would be a good thing then in that case, for them to act like fuses. Tape up your parallel connections, if not permanent, so one cannot get unplugged. I killed a pack letting that happen once.
But personally, I gave up using the balance wire parallel harnesses I built. For starters, there is enough wire already in a bigger pack, like 6 or 8 packs for 500 wh.
Secondly, my experience has been that they did not really need connecting, unless you are connecting to a balancing charger. The way I use my batteries, I tend to only need to balance about once every 3 months. They stay balanced.
So what if one pack has a weak cell, and needs to be supported by the other one, through the balance wire? If I have a cell that bad in there, I want to know which one, and get rid of that pack!!!!!
So you see, for me at least, no need at all to use that paralell harness on the balance wires, unless I'm doing a balancing charge on that pair of packs, on an RC charger. I just check each pack one by one with a cellog 8, and then can still charge just one low cell as needed with the RC charger, through the balance plug, at 2 amps or less.