Maintenance-free batteries

Make

Audi

Model

A5

Section

Electrical system; General information › Starter-current supply-CC › Maintenance-free batteries

Vehicle electricsMaintenance-free batteries

Central gas venting system To prevent the gas produced when charging the battery from causing damage or becoming a health hazard in the engine or passenger compartment, the gas is discharged through a central opening in the top of the battery cover. –  Make sure that the central gas venting system hose or pipe is always attached to the battery. –  Make sure the central gas venting system hose or pipe is not obstructed. Only then is the battery able to vent freely.   Note More modern batteries are equipped with a fine-mesh flame trap at the central gas venting outlet. This circular glass-fibre mesh with a diameter of approx. 15 mm and a thickness of 2 mm operates like a valve. It allows the gas given off during battery charging to escape and at the same time prevents ignition of the explosive gas in the battery.

05 General