Typically required as replacement for original when relevant error codes are on display or there is resistance when freewheeling (controller MOSFET damage).
Notes:
The two white wires with black JST SM 2-pin connectors are the speed limiter wire. When these two are connected, speed limit will be 25km/hr.
Not suitable for the VSETT 10+ Apex model, which has two separate front and rear controllers.
Some riders disable the regenerative braking to prevent damage from over-voltage, it is unknown if these newer black enclosure models are more resilient.
When fitting, ensure you have appropriate heatsinking applied for good thermal heat dissipation into the frame. Heatsink paste or thermal pads would be suitable.