346 Practical hintsReplacing SmartKey batteriesIf the batteries in the SmartKey are dis-
charged, the vehicle can no longer be 
locked or unlocked. It is recommended to 
have the batteries replaced at an autho-
rized Mercedes-Benz Center.Batteries contain materials that can harm 
the environment if disposed of improperly. 
Recycling of batteries is the preferred 
method of disposal. Many states require 
sellers of batteries to accept old batteries 
for recycling.
Replacement batteries: Lithium, type 
CR 2025 or equivalent.
Remove the mechanical key out of the 
SmartKey (
page 344).
Warning!
G
Batteries contain poisonous and corrosive 
substances. Therefore keep the batteries 
out of reach of children.
If a battery is swallowed, seek medical help 
immediately.
iWhen inserting the batteries, make 
sure they are clean and free of lint.iWhen replacing batteries, always re-
place both batteries. The required re-
placement batteries are available at 
any Mercedes-Benz Center.