The parameters can be read to determine the accuracy of the BCSU using Diagbox to determine if there is a problem - there is nothing you can physically do to check this. In the event of it failing, the BSI assumes control of energy management regardless and ignores the BCSU values.
A battery discharge is more prevalent in the winter months anyway - with more electrical consumption equipment being used, short journeys, not allowing the battery to get a good charge, more power needed to start the engine, poor earth connections, battery at end of service life (anything over 5 years on an X7), alternator not charging for example.
First thing is to see if the alternator is charging or not and if it is, then suspect the battery or its connections.
My 307 cc had the same issue, I picked up a 680cca battery half price on a eurocarparts sale and used some spare heavy gauge cable left over from an amplifier installation to upgrade the ground points from the battery to the alternator and to the chassis of the car, it's been fine since
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