I think you're correctly observing that there's a hole in the available smart charging specifications around the power levels needed for motorized bikes. USB-PD

I think you're correctly observing that there's a hole in the available smart charging specifications around the power levels needed for motorized bikes. USB-PD is perfect for most small devices, electric cars and larger have their own protocols, but 0.5-1 kWh batteries are left in the cold. (xkcd 927:1-3)