Genuine OEM Volkswagen Battery, part number N10437301. This small battery powers electronic components such as key fobs or lock cylinders. It is positioned at item 4 in the diagram. The battery has dimensions of 0.02m x 0.02m x 0.002m and weighs 0.0032 kg. Genuine OEM batteries provide reliable power for critical electronic functions, ensuring consistent operation of keyless entry and locking systems.