Regenerative braking
Recovers some motion energy as electricity while slowing the car.
Coordinated through the electric drive and brake-control systems.
The motor can generate electrical energy that is returned to the battery within traction and charging limits.
Turning the drive motor into an energy-returning brake.
Recovery changes with battery state, temperature, grip and settings; variation alone is not failure.
Battery and drive components are assessed with system diagnostics and model-specific warranty and service guidance, not a universal expiry age.
High-voltage work requires trained facilities. A complete pack differs from a serviceable module, sensor or charging-port repair; no numeric quote is asserted.
BMW regeneration supplements friction brakes, which remain essential even in strong one-pedal-style deceleration.
BMW battery-electric and plug-in-hybrid vehicles as equipped; generation and architecture matter.