Mercedes-Benz 2012 A-Class Owner's Manual page 79

X
Take the emergency key element out of the
key ( Y page 75).
X
Press emergency key element ; into the
opening in the key in the direction of the
arrow until battery tray cover : opens.
When doing so, do not hold cover : shut.
X
Remove battery tray cover :.
X
Repeatedly tap the key against your palm
until battery = falls out.
X
Insert the new battery with the positive ter-
minal facing upwards. Use a lint-free cloth
to do so.
X
Make sure that the surface of the battery is
free from lint, grease and all other forms of
contamination.
X
Insert the front tabs of battery tray
cover : and then press to close it.
X
Insert the emergency key element into the
key.
X
Check the function of all key buttons on the
vehicle.
Key
77
Z