2010 Mercedes ML-Class Owner's Manual - Page 312
2010 Mercedes ML-Class Manual
Page 312 highlights
310 Replacing SmartKey batteries i The required replacement batteries are available at any authorized Mercedes-Benz Center. Replacement batteries: Lithium, type CR 2025 or equivalent. X Remove the mechanical key from the SmartKey (Y page 306). X Slide mechanical key : back into the SmartKey. X Check the operation of the SmartKey. SmartKey with KEYLESS-GO SmartKey Practical hints X X X Press mechanical key ; into the SmartKey opening until battery compartment cover : opens. Do not keep the cover shut. Insert mechanical key : into opening. Press mechanical key : in direction of arrow. Battery compartment ; is unlatched. X Pull battery compartment ; out of the SmartKey housing. X X X Remove the battery compartment cover. Pat the SmartKey against the palm of your hand until battery = falls out. X Insert the new battery with the positive terminal (+) facing up. Use a lint-free cloth. X Insert the tabs of the battery compartment cover into the housing and press the cover closed. Pull out batteries =. Insert new batteries = under contact springs ? with the positive terminal (+) side facing up. X Return battery compartment ; into SmartKey housing until it locks into place. X Slide mechanical key : back into the SmartKey. X Check the operation of the SmartKey as well as the KEYLESS-GO function. X