Key Battery, Removing And Installing: Removing

-- Fold out the key blade -1- in direction of -arrow a-.

Courtesy of AUDI OF AMERICA, LLC

-- Using a small screwdriver -3-, lift up the battery compartment cover -2- in direction of -arrow b-.

-- Using a small screwdriver -3-, lift up the battery -1- from the battery compartment -2- in direction of -arrow-.

Courtesy of AUDI OF AMERICA, LLC