Question: How do I apply re-gen braking?
There are multiple ways to engage re-gen. Unlike engine braking, engaging re-gen is electronic and not mechanical.
Re-gen can be enabled by twisting the throttle grip or by applying brakes.
The throttle can be rotated in both +ve and -ve direction, it rests at a zero point if you let it go. The +ve direction allows a full angle of twist, while the negative direction only has ~5° of play.
Also, the regen alone cannot bring a vehicle to a complete stop as regen works only when the vehicle is in motion, as the vehicle slows down, the brake force also reduces.
Regen torque is a function of speed, just like air drag.
Moreover, with the 450, the re-gen gets disabled at speeds lower than 20kmph and it will work if the battery SoC is below ~84%