Mercedes ML GLC W164 X164 W204 Additional Backup Battery 12V 1.2Ah N000000004039

Mercedes ML GLC W164 X164 W204 Additional Backup Battery 12V 1.2Ah is an original component from the Batteries group, designed for Mercedes vehicles equipped with a separate auxiliary battery. Using a pre-owned unit of this type allows for a cost-effective way to restore proper power supply to comfort systems, electronics, or start-stop systems, while maintaining the factory performance characteristics of the 12V installation.

Specifications and technical data

• SKU: N000000004039
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: N000000004039
• Substitutable numbers: N000000004039, N 000000 004039
• Category: Batteries

Purpose and function of the 12V auxiliary battery

The presented backup battery is used in selected Mercedes W164, X164, and W204 class models as a separate power source for specific electrical circuits. Separating the main starter battery from the auxiliary battery stabilizes the voltage in the system, reduces drops during engine start, and supports the proper operation of advanced onboard electronics.

In practice, this translates into:

• more stable power supply for control modules and comfort systems,
• reduced load on the main starter battery,
• increased reliability of systems requiring a constant 12V voltage.

Benefits of using an original Mercedes battery

The original auxiliary battery from the Batteries group is designed for the specific electrical architecture of Mercedes vehicles. As a result:

• the correct charging and discharging characteristics are maintained within the factory system,
• electrical connections and mounts are matched to the location intended by the manufacturer,
• the risk of diagnostic system errors resulting from improper replacement parameters is minimized.

Choosing a used, original component allows for lower repair costs while maintaining compatibility with the installation and predictable behavior over a longer period of operation.

Installation and operational characteristics

The 12V backup battery in the discussed Mercedes models is mounted in a dedicated location in the body or luggage compartment, depending on the vehicle version. The design provided by the manufacturer allows for:

• secure mounting in factory brackets,
• connection to the existing wiring harness without the need for modifications,
• maintenance of proper cable routing and protection.

When replacing, it is recommended to check the condition of the cables, terminals, and ensure proper ventilation and protection of the mounting space to ensure stable operation of the auxiliary power system.

Using a pre-owned battery for cost optimization

In vehicles equipped with advanced electronics, the use of an auxiliary battery is standard, and its failure can cause various error messages and system malfunctions. Choosing a used component allows for reduced service costs, especially in older vehicles where the priority is maintaining efficiency within a reasonable budget. Combined with proper diagnostics and inspection of the charging system, this is a sensible service solution.

If you are planning a comprehensive repair or upgrade of the electrical power supply area in your Mercedes and need other components from the same group, such as main batteries, auxiliary batteries, or starter batteries, check the available parts in the Mercedes Batteries category.

Expert support and selection of recycled parts

When selecting used power system components and other parts, it is worth using proven sources of knowledge regarding the use of recycled parts. It may be helpful to read material describing the principles of safe component selection, their verification, and their impact on the total cost of repairing the braking system and related systems – detailed information can be found in the article Brake calipers under the microscope: How to effectively reduce brake system repair costs by choosing proven recycled parts.