On the Mercedes-Benz GLA 250, the second (auxiliary) battery is usually located inside the passenger-side footwell, behind a trim panel or under the floor mat area.
Here’s how to find it:
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Move the passenger seat all the way back.
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Look under the glove box or carpet area.
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You might need to remove a plastic kick panel or cover.
The auxiliary battery powers systems like stop/start and accessories, and it’s much smaller than the main one in the engine bay. If you need the exact location with step-by-step instructions and pictures, the service manual will show you everything, including how to safely remove and replace it.
Perhaps let us know the exact model and year of the GLA you're working with so we can assist you further ✌🏻
