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In the 2012 Mercedes CLS550, the extra battery is situated in the trunk. It plays a vital role in supplying power to the "stop-start" feature and running your car's accessories. If your car is starting smoothly but you're consistently seeing a red warning symbol on your instrument panel indicating a battery issue, you might need to swap out the 12-volt auxiliary battery. You have the option of going for the official Mercedes-Benz auxiliary battery or selecting a more budget-friendly alternative that fits the requirements.
You can locate the backup battery underneath the dashboard cluster, hidden behind the trim panel in the 2012 Mercedes CLS550.
In 2012, the location of the auxiliary battery on the cls550 is identified.