Genuine Specification Voltage Converter – Auxiliary Battery System

Product Name: Genuine Specification Voltage Converter – Auxiliary Battery System
Genuine Part Number: A205905341480
Alternative Part Numbers: 2059053414, 2059052809, 2054400073
OEM Manufacturer: HELLA (Made in Poland / Romania)
HELLA Cross Reference: 011590701

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Specification Overview

Genuine Mercedes-Benz specification voltage converter for the auxiliary battery system. This component is a sophisticated DC/DC converter that functions as the auxiliary battery unit in Mercedes-Benz vehicles equipped with ECO start/stop systems and electronic gear selectors.

Contrary to its common name (“auxiliary battery”), this unit is not a traditional battery but rather a voltage converter / capacitor module. It acts as a rechargeable power source for the vehicle’s low-voltage electrical system, supporting the ECO start/stop function, the “HOLD” function, and various electronic control units. The converter is recharged by the vehicle’s regenerative braking system.

• Type: DC/DC Voltage Converter / Capacitor Module

• Function: Auxiliary power supply for ECO start/stop and electronic systems

• Voltage: 12V DC output

• Connectors: 3-pin electrical connector

• Mounting Location: Right front footwell / under dashboard / behind glove box

• Made in: Poland/ Romania

• Quality: OEM / Genuine Specification

⚠️ Critical Note: This is NOT a conventional lead-acid battery. It is a voltage converter / capacitor module that serves the same functional role as an auxiliary battery but operates on different principles. Do not attempt to replace it with a standard 12V battery.

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Application & Engine Fitment

This voltage converter is used across a wide range of Mercedes-Benz models equipped with ECO start/stop systems and electronic gear selectors.

Comprehensive Model Fitment:

Additional Chassis Compatibility:

• W167, W205, W213, W217, W222, W223, W232, W238, W253, W257, W290

⚠️ Important: This voltage converter is used in vehicles with ECO start/stop systems and electronic gear selectors. Always verify the exact part number by VIN (17-digit chassis number) before ordering.

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Service Life & Change Intervals (Technical Data)

Standard Expected Lifespan:

• 4 to 6 years under normal conditions

Critical Adjustment for Kampala (Severe Operating Conditions):
The operational climate in Kampala (ambient temperatures 20°C–40°C), high humidity, and frequent stop-and-go traffic create a “Severe Duty” environment for all electrical components. High ambient temperatures accelerate the degradation of capacitors and electronic modules.

Recommended Replacement Interval under East African operating parameters:

• 4 to 5 years maximum

• For vehicles used primarily for short trips in the city, we recommend inspection starting from 3 years to prevent unexpected failure of the start/stop and HOLD functions

Failure Symptoms – When to Replace:

• “Auxiliary Battery Malfunction” warning on the instrument cluster

• ECO start/stop system not functioning

• “HOLD” function unavailable

• Intermittent electrical issues with ECUs or electronic systems

⚠️ Important: The voltage converter is plug-and-play – no software coding, reload, or calibration is required after installation.

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Packaging & Pricing (Alps Autoz Kampala)

Note: This part is available as both new and reconditioned/exchange units. Core charges may apply for exchange units.

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Technical Notes for the Workshop

• Installation Location: Right front footwell, under the dashboard, or behind the glove box. Access may require removal of trim panels.

• Installation: Plug-and-play installation. No software coding or calibration required.

• Identification: This is a capacitor/voltage converter module, not a traditional battery. It is significantly smaller and lighter than a conventional battery.

• Genuine vs. Aftermarket: Genuine MB A205905341480 is manufactured by HELLA to OEM specifications. Equivalent aftermarket brands:

  • HELLA 011590701

  • Dorman 601-531

• Storage: Shelf life of 5 years in unopened, sealed packaging. Store in a dry environment away from direct sunlight.

• Compatibility Note: This voltage converter is not compatible with vehicles without ECO start/stop systems or without electronic gear selectors.

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Alps Autoz – Kampala