One of my co-workers rides an electric skateboard, and I learned today that it has regen braking just like a Tesla. And just like a Tesla, if the board has a full battery, you don't get much if any regen braking. The big difference is that the Tesla also has friction brakes...unlike my coworker's skateboard. So, after charging up his board at the office one day last week, he had to jump off while going downhill at about 15 mph, because he had no way to stop or even slow down. (He and his skateboard got banged up a bit, but are basically OK.) Then he went to RTFM, where it specifically said not to ride downhill with a fully-charged battery. Bruce.