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As others have stated this is where the power disconnect switch is attached during transport.
BMW still has white batteries.
White batteries are traditional lead-acid.
Black batteries are AGM (absorbed glass mat).
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'12 Alpina B7 Alpina Blue/Black
'11 1M Coupe Alpine White
'11 M3 Coupe Silverstone/Black (sold)
'08 M6 Coupe Stratus/Black
'03 M5 Sedan Imola Red/Black (sold)
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