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Braking used to mean wasting energy. Brake Energy Regeneration puts an end to that, by capturing energy during braking and using it to charge the battery.More
As soon as you brake or take your foot off the accelerator, the alternator activates, capturing the vehicle's kinetic energy and feeding it to the battery as electrical energy. When the battery is adequately charged, the alternator disengages from the engine. This reduces the demand on engine output and lowers emissions. At the same time, the engine is free to deliver more of its power for accelerating the BMW X3.