12V Battery - Charging the 12V Battery

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Charging the 12V Battery

Your vehicle has a high voltage to low voltage energy transfer feature that keeps the 12-volt battery charged by the high voltage battery. If the 12-volt battery level is low, the high voltage battery transfers energy to the 12-volt battery when the vehicle is off.

12-volt battery depletion can still occur if the high voltage battery state of charge is low. See Preserving Your High Voltage Battery .

Always take care not to deep discharge the 12-volt battery as it may cause premature wear.

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Mustang Mach-E Owner's Manual