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There is no reason for the ICE to run faster when in battery hold mode (the LOAD on the ICE would increase as it's needing to both move the vehicle while dealing with the batteries' charge)...the connection to the transmission is identical. But, the EV motor can be switched to alternator mode any time power for the batteries may be needed...that may or may not result in an increase of charge, as the power may essentially just go through the DC-DC converter to keep the rest of the X5's 12vdc systems functioning.
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