Sorry in advance if this is a old subject, I have a very nice E53 only 40.000 on the clock, but have had battery issues for a while, new battery fitted alternator test all seems fine, I only use the card for work and at weekends, but short distances, when the car is parked up at home or at work I do not lock the vehicle and set the alarm, could this be the issue that the sat com and computer are still switch on and live which in time will drain the battery.. or could it be the starter motor issue as well..
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I have read that discounting the sat com, so it resets it self may be the answer, any more help would be great..
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Thank you very much stay safe all..
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Cheers
Andy