Mercedes-Benz 2012 A Class - 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
Opening and closing
Z