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These cars eat batteries if you don't do a lot of long distance driving. The N63 (50i) especially since the water pump and fan will run for up to 30 minutes after you shut off the car to cool the engine down which kills those batteries if you don't drive a road trip once in a while to charge up the battery. In fact the maintenance for the N63 calls for a new battery every second service which is pretty crazy if you think about it.
Not sure what you have, but like others have said charge the battery or replace it. Personally I charge up my battery every month with a battery tender to keep it tip-top shape.
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