Originally Posted by
phog
The brushless motor controllers in the rental scooters are sophisticated and programmable by the company for capping top speed, acceleration, setting a charge rate to the battery management board, setting degree of regenerative braking and when it engages, whether the scooter needs to be rolling (and how fast) before the motor will engage, and more.
There are high end e-scooters like the Nanrobot LS7 or RS11-11 that have huge range and go startlingly fast, at a premium price. That may be what you saw.
Rip out ALL the circuitry on a 36v, 300W rental bike, wire in extra cells to boost the battery to 52V, put in your own BMS and generic 48V, 300 watt controller, and you can make the thing move pretty fast for under $30. Not that I would endorse doing such a thing! And it would be primitive, throttle-only... you would no longer have all the refinements, like regenerative braking. Plus you would be driving the motor pretty hard. It could reduce the service life of the hub motor.