Gogogo - very popular, and pretty extensive coverage [0]. The only problem is the scooters themselves are so quiet they sneak up behind you on the street.

[0] www.gogoro.com/gogoro-network

There are guys who ride around swapping the batteries in public rental bikes too - they send an alert when the batteries are low and a guy just drives around swapping ones near his current location.

The batteries are small compared to what you'd need for a car - they're maybe slightly larger than a standard lead-acid battery.

Silence (https://www.silenceuk.com/) has scooters and "microcars" with swappable batteries. If I remember correctly, their batteries might have wheels as well so they're easier to move around, since they weight a bit.

All over mainland china as well, works great for small vehicles like mopeds etc (because the battery is light enough to be swapped by an individual person without tools). Probably helps reduce fire risk as well (because people aren't charging themselves indoors).

Wow, I've just googled it and seen a video about it - pretty amazing !