The 50cc/45 kmh or 4kw/45 kmh for electric ones defines a class of vehicles (mopeds L1, L1e-b if two wheels) that have a simpler registration and need a simpler driving license.
Electric powered bikes exist (Powered cycles, L1e-a) with 1 kW/25 kmh, while electric assisted bycicles and scooters[1] are "out of scope".
[1] the kind of electric sccoters with tiny wheels and no seat, "scooter", at least here in Italy, is commonly used to call anything with smaller wheels than a motorbike, it is used also for (powerful) motorbikes of class L3.
The 50cc/45 kmh or 4kw/45 kmh for electric ones defines a class of vehicles (mopeds L1, L1e-b if two wheels) that have a simpler registration and need a simpler driving license.
Electric powered bikes exist (Powered cycles, L1e-a) with 1 kW/25 kmh, while electric assisted bycicles and scooters[1] are "out of scope".
It's complicated:
https://en.wikipedia.org/wiki/Vehicle_category
[1] the kind of electric sccoters with tiny wheels and no seat, "scooter", at least here in Italy, is commonly used to call anything with smaller wheels than a motorbike, it is used also for (powerful) motorbikes of class L3.