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Originally Posted by GregW / Oregon
If you understood this you would not be wondering if the M3 has a special battery. Peace!
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Why are you having such a hard time with this?????
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Called "Brake Energy Regeneration," BMW's solution is to plop in an oversized battery and engage the alternator only during deceleration. By actively controlling the alternator and battery charge electronically, the alternator just freewheels happily during cruise and acceleration while the battery supplies the necessary juice for the car.
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http://www.edmunds.com/insideline/do...leId=115127#14