Mercedes-Benz C-Class Operator's Manual page 87

Repeatedly tap the SmartKey against your
X
palm until battery = falls out.
Insert the new battery with the positive ter-
X
minal facing upwards. Use a lint-free cloth to
do so.
Make sure that the surface of the battery is
X
free of lint, grease and other contaminants.
Insert the front tabs of battery compartment
X
cover : into the housing first and then press
to close it.
Insert mechanical key ; into the SmartKey
X
( page 83).
Y
Check the function of all SmartKey buttons on
X
the vehicle.
SmartKey
85
Z