I had a software update which allegedly fixes it but didn't, eventually found to be a faulty battery control unit which was preventing the battery from becoming fully charged. There's a whole series of diagnostic regimen that your technician should follow to determine the cause of the fault.

I think it's normal that the warning stays there until you reset it by switching off the ignition. I've noticed at the same time the date/time and trip computer settings are all lost.

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Fastbuck
2009 F01 7 Series 3.0D SE Saphire Black/ Oyster
2008 E83 X3 2.0D SE Montego Blue/ Black
2007 E70 X5 3.0D SE Space Grey/ Beige - SOLD
2006 Land Rover Freelander Sport TD4 Zambezi Silver/Black - SOLD
2005 W203 C200K Sports Coupe Jasper Blue/Artico Black - SOLD
2004 W211 E320 CDI Avantgarde Brilliant Silver/Alpaca Grey - SOLD
2001 E39 530i SE Crystal Green/ Beige - SOLD