Battery, Disconnecting And Connecting: Disconnecting

-- Switch off the ignition and all electrical equipment and remove the ignition key.

Vehicles with a Battery Housing 

-- Open the locking mechanism -arrow- and remove the battery case cover.

Fig 1: Battery Box Cover Locking Mechanism

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Vehicles with a Battery Jacket 

-- Open the battery jacket -1-.

Fig 2: Identifying Battery Jacket

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Continuation for All Vehicles

-- Loosen the nut on the battery ground cable clamp -3- several turns.

Fig 3: Identifying Battery Terminal Ground Cable

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Remove the battery ground cable clamp -3- from the Battery -A- -1-.