Audi A4 B9 A5 F5 MHEV 48V High Voltage Battery 3.0 Diesel 9.5Ah 446Wh 4M0915105B

Audi A4 B9 A5 F5 MHEV 48V High Voltage Battery 3.0 Diesel 9.5Ah 446Wh is a high-voltage battery designed for 48V mild-hybrid systems in vehicles with a 3.0 Diesel engine. Engineered by Audi, it serves as a factory-original solution for vehicles equipped with an MHEV system, supporting powertrain operation and energy recovery systems. It is a practical choice for users seeking an original component for professional electrical system repairs.

Specifications and technical data

• SKU: 4M0915105B
• Mark: Audi
• Condition: Used
• OEM Part Number: 4M0915105B
• Substitutable numbers: 4M0915105B, 4M0 915 105 B
• Fuel type: Diesel
• Category: Battery & BMS Units

Application in the 48V MHEV system

The presented high-voltage battery operates within a 48V installation, typical for mild-hybrid systems used in modern Audi A4 B9 and A5 F5 models with diesel engines. It is responsible for powering recuperation systems, assisting with engine starts, and reducing the load on the alternator, which translates into stable powertrain operation and improved energy efficiency.

With an energy capacity tailored to 3.0 Diesel systems, the battery provides sufficient power reserves for start-stop functions, acceleration assistance, and powering electrical consumers during high-load modes. It is a key component for the proper functioning of the entire 48V system.

Benefits of using an original Audi battery

Choosing an original Audi high-voltage battery for the 48V MHEV system ensures that the electrical installation maintains its factory performance parameters. The component is structurally matched to the vehicle's architecture, which facilitates installation and minimizes the risk of compatibility issues with control units and safety systems.

The main advantages of this solution include:

• consistency with the factory charging and energy management strategy in the mild-hybrid system,
• electrical capacity properly matched to the loads generated by the diesel engine,
• maintenance of stable voltage parameters in the 48V installation,
• reduction of the risk of errors in the vehicle's diagnostic systems.

For users considering the installation of pre-owned parts, our article on choosing between new and used car parts, which discusses costs, quality, and component durability, may be helpful.

Operating characteristics in the 3.0 Diesel engine

The battery is designed to work with Diesel engines, where the 48V MHEV system intensively supports starting and energy recuperation. The electrical capacity and energy stored in the battery are adapted to the high torque and frequent charge/discharge cycles typical of 3.0 engines.

Such parameter matching promotes stable operation of the start-stop system, limits voltage drops under high load, and supports the smooth operation of comfort and safety features that rely on the 48V power supply.

Condition, verification, and service application

The offered battery is a used part, making it an attractive cost-effective alternative while maintaining the manufacturer's original specifications. This type of component is particularly useful for post-accident repairs, replacing a damaged high-voltage module, or restoring full functionality to the mild-hybrid system after a failure.

Before installation, standard diagnostics of the 48V system and verification of the Battery Management System (BMS) operation in the vehicle are recommended. This ensures that the full potential of the original battery is utilized and reduces the risk of secondary faults.

Where to find related 48V system components

If you are planning comprehensive maintenance of the mild-hybrid system or are looking for other components related to energy storage and management, check our category Electric vehicle batteries and BMS{data-blogs=category}. You will find related high-voltage installation components there that will allow you to build a coherent service kit for your vehicle.