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FWIW, under some driving conditions, the 48vdc battery doesn't get charged ideally. While a battery maintainer can keep the 12vdc system topped off if that has issues (more common than the 48vdc system), unless there's >20A going in, the 48vdc system won't get recharged. People might want to consider putting a >20A charger on their vehicle WITH THE HOOD OPEN! once in a while or after that message, and see if that resolves the issue. The 48vdc system is disconnected if the hood isn't open, so to recharge it, you need those two things:
- high enough current
- the hood open.
With the way BMW does battery maintenance (essentially only when braking or slowing down), and it has a huge alternator, if it's not able to run that often, neither battery system may get fully recharged, then you have some weird, sometimes intermittent problems...
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