Does your Mercedes vehicle have one battery – or two?
How To Solve Your Mercedes Auxiliary Battery Malfunction SG
Auxiliary battery malfunction - can anyone shed some light on this and what they've done in this situation? Everything works incl. stop start etc…GLC250d, 2015 : r/mercedes_benz
How to replace an Auxiliary battery in the Mercedes CLA250 GLA250 - YouTube
Genuine Mercedes-Benz auxiliary battery, electrical System battery 12V – Mercedes Genuine Parts
Auxiliary Battery Malfunction Replace: Mercedes Benz E-Class W212 - YouTube