Temperature abnormality / shorter circuit / under voltage automatic sleep / over current / over charge / over discharge security Speaking of brakes, almost all scooters have some sort of handbrake; some will have a secondary brake that can be activated by urgent down over a scooter's rear fender. https://electric-scooter-varla42951.blogitright.com/30098045/detailed-notes-on-haibadz-electric-scooters-50cc