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The HV battery pack can charge the 12 V battery only when the HV system has been activated. This occurs when an i3 is being actively charged (an EVSE being plugged in insufficient if the battery pack is full) or when the car's state is drive readiness, operating readiness, or, I believe, radio readiness. So when an i3 is resting with its HV system inactive, the 12 V battery won't be charged and is being discharged by parasitic loads.
