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Thats pretty much the norm, the systems start to operate in error when the 12v gets low voltage, the errors are logged, often there are communication errors recorded in the various ECU's. They usually clear once 12v is restored.

Yes I connected as you suggest, straight to the battery terminals, the only errors were related/caused by low 12v, it creates mayhem.

Have you tried it in anger yet? Following your recommendation on here, I bought one last week because I'm having some 12v issues with my i3. This morning was one those occasions so I reached in the glovebox, pulled out the trusty jump starter and it behaved exactly as the instructions said. The...