1 Answer:
  • john chak
    On to the type of battery which is very simple to determine with factory original BMW batteries, a white battery is a standard lead acid battery, and a black battery indicates an AGM (Boron-Silicate absorbed glass mat).
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  • What does a blue battery light mean on a BMW?

    The blue battery symbol does indeed represent it is charging the battery through "Brake Energy Regeneration". This takes place when braking or coasting (deceleration events) where the alternator engages to charge the battery.Jun 13, 2013