Mercedes-Benz C-Class 2008 Owners Manual - Manual (Page 430)

429
Practical hints
Replacing SmartKey batteries
3 Batteries
4 Contact springs
̈ Pull out batteries 3.
̈ Using a line-free cloth, insert new bat-
teries
3 under contact springs 4 with
the positive terminal (+) side facing up.
̈ Return battery compartment 2 into
housing until it locks into place.
̈ Slide the mechanical key back into the
SmartKey.
̈ Check the operation of the SmartKey
or SmartKey with KEYLESS-GO*.