I was getting the "Auxillary Battery Malfunction" warning from time to time while driving 2014 Mercedes GL450. Did some research online and found that replacing this battery was quite easy. This video shows the process.

Tools Needed:
flat head screwdriver
10mm socket wrench w/extension

Parts:
Yuasa NP1.2-12 12V/1.2AH bought on amazon:
[ Ссылка ]

If you don't feel comfortable with the non factory battery, you can buy the OEM one here:
Mercedes-Benz GL450 GL550 Auxillary Back Up Battery 000000004039 OEM
[ Ссылка ]

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