Mercedes-Benz SL-Class 2013 Owners Manual - Manual (Page 90)

X Repeatedly tap the SmartKey against your
palm until battery = falls out.
X Insert the new battery with the positive
terminal facing upwards. Use a lint-free
cloth to do so.
X Make sure that the surface of the battery is
free of lint, grease and other contaminants.
X Insert the front tabs of battery
compartment cover : into the housing
first and then press to close it.
X Insert mechanical key ; into the
SmartKey.
X Check the function of all SmartKey buttons
on the vehicle.
88
SmartKey
Opening
and
closing