current property nonsense

You do realise that by using usb-c in this way, you’d be creating a proprietary connector, because there’s a lot more to usb than just the shape of the plug?

Not to mention that it would probably fail pretty quickly as the contact resistance is too high to handle the currents of a power tool. Compare a connector people usually use for batteries like an xt30/xt60 to a tiny usb-c one and you’ll see what I mean.

If the goal is to make it so you can buy any brand battery and use it with any brand tool, I’d look into making contact adapters instead.