2008 Mercedes SL-Class Owner's Manual - Page 408

Practical hints Replacing SmartKey batteries Replacing SmartKey batteries If the batteries in the SmartKey or the SmartKey with KEYLESS-GO* are discharged, the vehicle can no longer be locked or unlocked. It is recommended to have the batteries replaced at an authorized Mercedes-Benz Center. Warning! 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. Remove the mechanical key from the SmartKey or SmartKey with KEYLESS-GO* ( page 403). G i When inserting batteries, make sure they are clean and free of lint. Batteries contain poisonous and corrosive substances. Therefore keep the batteries out of reach of children. If a battery is swallowed, seek medical help immediately. i When replacing batteries, always replace both batteries. The required replacement batteries (Lithium, type CR 2025 or equivalent) are available at any authorized Mercedes-Benz Center. 1 Mechanical key 2 Battery compartment Insert mechanical key 1 into opening. Press mechanical key 1 in direction of arrow. The battery compartment is unlatched. Pull battery compartment 2 out of the housing. Warning! G SmartKey batteries contain Perchlorate material, which may require special handling and regard for the environment. Check with your local government's disposal guidelines. California residents, see http://www.dtsc.ca.gov/HazardousWaste /Perchlorate/index.cfm. 407