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Old 01-13-2013, 11:50 AM
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Location: San Francisco
Join Date: Aug 2009
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Mein Auto: 2009 E93 N54
Originally Posted by emh View Post
Thanks everyone. Sounds like I'll just take it to the dealer and get the battery replaced.

As an engineer, this seems like bad system design to me. I don't see why the battery management system can't detect a sudden change in battery characteristics (as would be evident in a battery swap) and put itself into a learning mode that figures out what would be optimal for the new battery (instead of retaining what it "knew" about the old battery). Oh well... it is what it is I guess.

Interesting! How would the ECU know how to charge a battery of unknown construction and capacity?
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