How to fix Auxiliary Battery Malfunction on Mercedes S550 w221

In this video I answer these questions:
What is the Auxiliary battery used for?
Why does it fail? How to replace it?

If you'd like to jump right to the answer:
0:49 What is the Auxiliary Battery used for?
1:30 Why is the "Auxiliary battery malfunction" message displayed?
2:21 How to replace the Auxiliary Battery?
This is the same repair process for all 2007 2008 2009 2010 2011 2012 and 2013 Mercedes-Benz S550 w221.

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