2007 Mercedes GL-Class Owner's Manual - Page 507

Practical hints 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 Light Truck Center. Warning! i When inserting the batteries, make sure they are clean and free of lint. i When replacing batteries, always replace both batteries. The required replacement batteries are available at any Mercedes-Benz Light Truck Center. G Replacement batteries: Lithium, type CR 2025 or equivalent. Remove mechanical key 1 from the SmartKey or SmartKey with KEYLESS-GO* ( page 500). 1 Mechanical key 2 Battery compartment Insert mechanical key 1 into opening. Press mechanical key 1 in direction of arrow. The battery compartment 2 is unlatched. Pull battery compartment 2 out of the SmartKey housing. Keep the batteries out of reach of children. If a battery is swallowed, seek medical help immediately. 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. 506