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Having had this issue, I can safely say that I'm happy the car is smart enough to put itself in "power down" mode when the battery gets to about 60ish percent charge. This way, you get a warning but still have enough juice to start the car.
However-and this is important...
When you get this message, you either need to drive the car for a loooong (like two hours on the freeway) time, or put the car on a Battery Tender or a CTEK as soon as possible. The car is basically telling you it probably won't start if you continue your regular driving pattern.
Our X3 gets mostly city miles, and is driven max 3 days a week. That obviously isn't the pattern the BMW engineers had in mind when they came up with the smart alternator charge algorithm. Thus, it needs the CTEK overnight every few months to keep the battery healthy. I'm okay with that. I'm not saying June shouldn't be angry with the issue... I'm just sharing a sure fire fix.
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