I don't like that batteries are "black boxes" - we don't know what's going on inside, we only have one piece of info: total voltage. So, for my custom 14s battery for my escooter, I bought this 16-pin connector: that will be connected to individual parallels, so I can measure voltage of each parallel at any time without disassembly, and balance manually, if needed. If this idea proves usefull, I'll install a similar connector (22-pin) on my EUC, too.