2005 Mercedes E-Class Owner's Manual - Page 417

Practical hints Replacing SmartKey batteries Replacing SmartKey batteries If the batteries in the SmartKey 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! i When inserting the batteries, make sure they are clean and free of lint. SmartKey Replacement batteries: Lithium, type CR 2025 or equivalent. Remove the mechanical key 1 ( page 410). i When replacing batteries, always replace both batteries. The required replacement batteries are available at any Mercedes-Benz Center. G 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. 1 Mechanical key 2 Battery compartment Insert the mechanical key 1 in side opening and push gray slide. Battery compartment 2 is unlatched. Pull battery compartment 2 out of the housing in direction of arrow. Remove the batteries. 415