Where is the auxiliary battery of Mercedes-Benz CLA located?

2 Answers
LeCarlos
09/05/25 4:29am
The auxiliary battery of Mercedes-Benz CLA is located on the right side of the trunk. Solutions for auxiliary battery failure: First, check the generator's belt and plug to see if there is any looseness, as poor contact caused by looseness can be resolved by tightening. Check if the battery is out of power; if so, charge the battery. For specific situations, it is recommended to visit a 4S shop for professional inspection and then decide on repairs based on the results. Battery lifespan depends on usage frequency: The longevity of a car remote key mainly depends on how frequently the owner uses it. For all battery-powered devices, the more frequently they are used, the more power they consume.
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CooperFitz
09/17/25 4:58am
I remember the last time I replaced the auxiliary battery for my Mercedes-Benz CLA myself, the location in the trunk is actually quite particular. After lifting the trunk floorboard, there's a hidden compartment, usually near the spare tire well or behind the right-side trim panel. You'll find it by removing the foam box with Velcro. This auxiliary battery mainly powers the start-stop function, is about half the size of the main battery, and also operates at 12V. When searching, pay attention to the shape of the foam box—the rectangular one is it, don't confuse it with the tool kit. The position may vary depending on the car's age; for example, the 2018 model has it on the right side of the spare tire, while the 2020 model might have it shifted to the left. If you really can't find it, taking a photo of the trunk and posting it in a Mercedes-Benz owners' group is faster than flipping through the manual.
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