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I have a 550 and under the recent customer care package I had the larger capacity batter installed.
Within a week, mid-drive, my car cycled through ever conceivable error you can imagine. Headlights to all wheel drive and transmission errors, one after another. My car went into limp mode and the idrive screen eventually went solid orange and unusable.
I pulled of the road and turned of the car. The car did not restart. I was a sitting duck until a local State Farm "road ranger" came. I told him to give me a jump, the car restarted with no errors and I drove straight to the dealership.
Once before, and only a few weeks prior my car did this but before it went to far I turned off the car. I was in a parking lot.
The car restarted with no errors and the above was the next time after.
I kept my car on a nice trickle charger because the new battery, like its predecessor was lasting about 3-4 days then would give me the discharge error. I charged the car it went away.
Tuned out, the car needed a new alternator the entire time!
Since the replacement was installed, the car has been back to normal.
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