Description
The part number N000000004039 is a genuine Mercedes-Benz auxiliary battery unit designed for use in various Mercedes models, particularly those requiring a low-capacity backup battery (often for start/stop systems, emergency call modules or auxiliary electronics).
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It is specified as a 12V, 1.2 Ah rechargeable lead acid battery in several listings. HnD Automotive Parts+2mdsbattery.co.uk+2
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Fitment: It is used in models including the A-Class (176/177), B-Class (242/246/247), C-Class (204), CLA/CLS, E-Class (212), G-Class (463), GLE/ML (166), R-Class (251), among others. Mercedes Genuine Parts+1
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Function: Acts as an auxiliary battery to support vehicle electrical systems when the main battery is offline or disconnected, maintain memory/ECU states, or assist in the vehicle’s “ready” state for certain functions.
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Replacement: When this part fails, you may notice warning lights related to electronics, inability to perform certain start/stop or emergency features, or the vehicle may require coding/reset after replacement.
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OEM quality assures correct dimensions, terminal placement, capacity and durability.
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