Hey how are you ,I will Try to Help you with This Issue
Can you run this test below
and You will need a Capable Mercedes Star Factory scanner or equivalent to Read the Fault codes in All Modules needed and based on these faults we can pull up a Pin Point Troubleshoot and be Accurate ,If you get the Faults Read ,post them back here for me and I can Help You Further on it & we be Accurate
and correct the Battery control module is a common issue and not the only issue , so with out testing we end up throwing parts at it
BUT CLICK ON LINK TO VIEW PDF FILE SHOWING YOU THE BATTERY CONTROL MODULE LOCATION, CHECK ELECTRICAL CONNECTOR ON IT AND WIRES, CHECK FOR ANY BACKED OUT PINS MAKING POOR CONNECTION, BUY SOME CRC ELECTRICAL CONTACT CLEANER ,SPRAY CONNECTION AND RETEST
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Thank You?Chad Farhat?ASE Certified Technician