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When I updated the maps, I simply plugged in the USB stick into the port in the glove compartment when I was going to run some errands. Even though the download would pause when I parked, it would resume as soon as the car was started. All told, it took about 30 minutes for the complete download. Even if you were to leave the car in ACC mode for the download, it is not going to use enough power to make a difference to the battery.
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 NB8S Past Garage: Z4, 135i. Present Garage: 2013 X Drive X1 2.8i. |