Mercedes-Benz SLK Operator's Manual page 76

SmartKey
74
Press mechanical key ; into the opening
X
in the key in the direction of the arrow until
battery compartment cover : opens.
When doing so, do not hold battery
compartment cover : shut.
Remove battery compartment cover :.
X
Repeatedly tap the SmartKey against your
X
palm until battery = falls out.
Insert the new battery with the positive
X
terminal facing upwards. Use a lint-free
cloth to do so.
Make sure that the surface of the battery is
X
free from lint, grease and all other forms of
contamination.
Insert the front tabs of battery
X
compartment cover : into the housing
and then press to close it.
Insert mechanical key ; into the
X
SmartKey.
Check the function of all SmartKey buttons
X
on the vehicle.