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Do I have to charge the 12-volt battery of my CE 04 separately?

If the state of charge of the 12 V battery falls below a defined threshold value, the recharging function is activated. The 12 V battery is then recharged by the high-voltage battery via the DC/DC converter. This ensures a sufficient state of charge of the 12 V battery.

 


The recharging function is active in the following situations:

  • While the vehicle is in motion:  The 12 V battery is recharged if necessary.
  • During the charging process:  The 12 V battery is recharged in addition to the high-voltage battery.
  • During periods of parking:  The state of charge of the 12 V battery is checked every other day and recharged if necessary.

During recharging, noises of the fan and coolant pump may be audible.

Urban Mobility
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CE 04 | BMW FAQ