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Where to Find the Secondary Battery of the Mercedes A-Class

Model: Mercedes Classe A W177 - Years 2018-2026
Part: Battery

The Mercedes A-Class has a secondary battery located under the passenger side mat, directly beneath the glove compartment. By removing the upholstery - which is only laid down, nothing needs to be cut - you will discover a compartment with a tab. Pressing that tab will allow you to pull out a small 12V, 1.2 A battery, part number N000000004039. The auxiliary battery is a recent innovation, primarily used in BMW and Mercedes vehicles to assist with Start and Stop functionality, preventing malfunctions if the main battery is too stressed from normal use.

Updated on 16 July 2026 by ScegliAuto

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