Genuine OEM Volkswagen Battery Retainer, part number 2N0805603B. This retainer is designed to securely hold the vehicle's battery in its designated mounting position, preventing shifting during operation. It is specifically for the left side of the battery mounting area, integrating into the underbody structure. Weighing 0.0835 kg and measuring approximately 10 cm in length, it is a small but critical securing component. Using a genuine OEM battery retainer ensures the correct dimensions and material strength to withstand vibrations and impacts, maintaining battery stability and preventing electrical issues.