pull off engine "weatherstripping" at back of engine bay, in front of Battery.
remove plastic pieces covering battery area
remove the passenger side plastic trim piece near the windshield wipers (it has three clips that are undone with a turn of a Phillips screwdriver.
Battery will then be accessible to remove with a 10mm socket.
reinstall is reverse of removal.
The 2009 Audi S4 has a V8 engine.
The 2014 Audi S4 has 24 valves.
The 2008 Audi S4 has 40 valves.
The 2014 Audi S4 has a V6 engine.
The 2005 Audi S4 has 40 valves.
The 2011 Audi S4 has 24 valves.
The 2001 Audi S4 has 30 valves.
The 2004 Audi S4 has 40 valves.
The 2008 Audi S4 has a V8 engine.
The 2001 Audi S4 has a V6 engine.
The 2002 Audi S4 has 30 valves.
The 2006 Audi S4 has a V8 engine.