Hello I have same car and had the same issue but easy fix go to dealer and buy the bmw Motercycle battery charger and take positive wire off and charge battery after done drive your car with no lights or radio and if possible no heater or a.c. this will reset the battery due to the safety feature your car should shut systems down at 9 volts
I have found that the amount of power the car uses when just opened will drain the battery very quickly - I no longer open the car unless I am going to drive it and I put a charger on if I want to do any work to it or even hoover it !
you may be wise to get a new battery and get it registered correctly as a low battery (or incorrect battery) causes many errors and problems!
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