When working at a factory in Shanghai, I was supprised at the number of electric scooters there. they had several different battery types, some the battery was the floor board, some the battery was under the seat. All of them were removable, and the factory had a 3 level bench just next to one entrance and battery changers were placed there. Considering the pennies it took to charge It was nice to see, even china, companies helping the "green" scooters out.