2005 Mercedes E-Class Owner's Manual - Page 418
2005 Mercedes E-Class Manual
Page 418 highlights
Practical hints Replacing SmartKey batteries SmartKey with KEYLESS-GO* Replacement batteries: Lithium, type CR 2025 or equivalent. Remove mechanical key ( page 410). Pull battery compartment out of the housing in direction of arrow. Using mechanical key 3 apply pressure to position 2. Battery 1 tilts up slightly. Pull out batteries 1 in direction of arrow. Using a lint-free cloth, insert new batteries with the plus (+) side facing up. Return battery compartment into housing until it locks into place. 3 Battery 4 Contact spring Using a lint-free cloth, insert new batteries under the contact spring with the plus (+) side facing up. Return battery compartment into housing until it locks into place. 1 Battery 2 Tilt battery up 3 Mechanical key Insert the mechanical key 3 in side opening and push grey slide. Battery compartment is unlatched. 416