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Perhaps the "Consumption" display could show warning signs that indicate an impending problem with the 48 volt system. I suggest you should check this periodically, maybe at least once a day if you have concerns.
I'm not sure what display of battery/charging is incorporated into the latest MBUX. On my '19 CLS53 (no MBUX) this display is accessed by selecting "Vehicle" and then "Consumption". The green bars show "Charge %" which is NOT the amount of charge on the the Lithium battery. It is the percent of charging BEING APPLIED by the MGU to the batteries. I complained to MBUSA that we need a display of the charge level of the battery such as is provided to the EVs, but no such luck. Maybe with MBUX try saying "Hey, Mercedes, what is the charge level on my batteries?"
Two samples of this display are attached below. The first is typical of "normal" driving where the "Charge %", the amount of charging being supplied is 5-10% of the maximum output of the MGU over a 30 minute period (you can select 60 minutes also). The second image was taken during the long, 15 mile descent into Denver from the mountains where the charge occasionally reaches near 100%. If your system is operating normally, you should see displays like this and if you become familiar with how this display looks under various driving conditions, you might be able to detect an impending problem. Let us know if you see anything anomalous.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
