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Position and functions of the auxiliary battery of the Mercedes G-Class

Model: Mercedes Classe G W4631st - Years 1989-2018
Part: Battery

In this video, we see the position and function of the auxiliary battery on a Mercedes G-Class. It is a small 12-volt battery that accompanies the main battery. Its main function is to support the start & stop system, in order to reliably restart the engine when the ECO system turns off the engine, and it also serves as a voltage stabilizer to protect the electronic modules that are more sensitive to voltage fluctuations. It is located in the engine compartment, on the right side, and is enclosed in a black plastic box, with a red positive terminal, easily distinguishable from the main battery, which is much larger.

Posted on 27 August 2025 by ScegliAuto

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