Genuine OEM Volkswagen Battery Monitoring Control Unit, part number 5QA915181E. This electronic module is responsible for accurately monitoring the vehicle's battery performance, state of charge, and overall health. It is typically mounted directly to the battery terminal. Weighing 0.293 kg, this unit provides crucial data to the vehicle's electrical system. Using a genuine OEM control unit ensures correct firmware, precise sensor calibration, and seamless integration with the vehicle's complex electrical architecture for reliable battery management.