Product Name: Genuine Mercedes-Benz Auxiliary Battery – 12V 1.2Ah AGM
Genuine Part Number: N00000004039
Alternative Part Numbers: 000000-004039, A00000004039, 00004039
Made in: Taiwan
Specification Overview
Genuine Mercedes-Benz auxiliary (back-up) battery. This is a Valve Regulated Lead-Acid (VRLA) battery, utilizing Absorbent Glass Mat (AGM) technology. It is a maintenance-free, non-spillable sealed lead-acid battery designed as a backup power source for the vehicle’s electrical system.
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Type: VRLA / AGM (Sealed, Maintenance-Free, Non-Spillable)
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Voltage: 12V
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Capacity: 1.2Ah (Amp-hours)
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Cold Cranking Amps (CCA): 200A
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Dimensions: Approx. 110mm (Length) x 90mm (Width) x 85mm (Height)
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Weight: Approx. 1.2 lbs (0.54 kg)
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Features: Overcharge Protection, Start-stop Suitable, Maintenance Free
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HazMat: This part contains hazardous materials and requires special handling for shipping.
Application & Engine Fitment
This auxiliary battery serves as a secondary power source for various electrical functions, including the Start/Stop system, the “HOLD” function, the Electronic Stability Program (ESP), the ECUs, and the alarm system.
Comprehensive Model Fitment:
| Chassis / Model | Examples |
|---|---|
| A-Class (W176, W177) | A 180, A 200, A 220, A 250, A 35 AMG, A 45 AMG |
| B-Class (W242, W246, W247) | B 180, B 200 |
| C-Class (W204) | C 180, C 200, C 220, C 250, C 300, C 350 |
| CLA-Class (C117, C118) | CLA 180, CLA 200, CLA 250, CLA 35 AMG, CLA 45 AMG |
| CLS-Class (W218) | CLS 220, 250, 350, 500, 550, 63 AMG |
| E-Class (W212) | E 200, E 220, E 250, E 300, E 350, E 400, E 500, E 550 |
| G-Class (W463) | G 350, G 500, G 55 AMG, G 63 AMG |
| GLA-Class (X156) | GLA 200, GLA 250, GLA 45 AMG |
| GLB-Class (X247) | GLB 200, GLB 250, GLB 35 AMG |
| GLE-Class / ML-Class (W164, W166) | ML 350, ML 500, GLE 350, GLE 400, GLE 43 AMG, GLE 53 AMG |
| R-Class (W251) | R 350, R 500 |
| S-Class (W221, W222, W223) | S 350, S 400, S 450, S 500, S 550, S 560 |
| Sprinter (W907, W910) | Sprinter 1500, 2500 |
| V-Class / Vito (W447) | V 220, V 250, V 300 |
| Metris (W447) | Base |
⚠️ Important: This is a backup/auxiliary battery, not the main starter battery. It is often smaller and located in various positions (e.g., under the dashboard, in the seat base, or in the engine bay). Always verify the exact part number by VIN (17-digit chassis number) before ordering.
Service Life & Change Intervals (Technical Data)
Standard Expected Lifespan:
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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. High ambient temperatures significantly accelerate the chemical degradation of the battery.
Recommended Replacement Interval under East African operating parameters:
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3 to 5 years maximum.
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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:
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“Auxiliary Battery Malfunction” warning on the instrument cluster.
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Start/Stop system not functioning.
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“HOLD” function unavailable.
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Intermittent electrical issues with the ECUs or alarm system.
⚠️ Important: A failing auxiliary battery can cause a cascade of electrical errors. Replacing it promptly resolves many of these “phantom” electrical malfunctions.
Packaging & Pricing (Alps Autoz Kampala)
| Packaging | Genuine Part Number | Price (UGX) |
|---|---|---|
| 1 Unit (Auxiliary Battery) | N00000004039 | Inquire |
Technical Notes for the Workshop
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Installation: The replacement procedure can be more complex than changing a main battery. The auxiliary battery is often located in hard-to-reach places (e.g., under the driver’s seat, behind the dashboard). Consult the vehicle-specific service manual.
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Registration: In most models, the auxiliary battery does not require “coding” or “registration” with the vehicle’s computer system, unlike the main starter battery.
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Genuine vs. Aftermarket: Equivalent aftermarket brands with the correct specifications (12V, 1.2Ah, AGM) include:
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Bosch AGM Backup Battery 12V 1.3Ah
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Casil 12V 1.2Ah SLA AGM Battery
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HazMat: This part contains hazardous materials and requires special handling for shipping.
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Compatibility Note: This battery is for dual-battery system vehicles. It is not a replacement for the main starter battery in single-battery systems.
Alps Autoz – Kampala
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