This only applies to scooters that have a native Kinetic Energy Recovery System. (e.g: Xiaomi, Ninebot)
Disabling KERS might result in failure of the control board and in injuries caused by strong braking.
KERS is necessary to prevent a high voltage at the gate of the MOSFETS.
Setting KERS on Strong provides too much current and can burn a MOSFET or a track.