how do you replace the battery in the key

very easy.....you know how to release the manual key from inside the fob?? you then look inside the hole it was removed from...using the opposite end of the key, (the angle curved end) stick it in the end, opposite the ring notch side (there is a hole for it!!!) then release the latch again, and WITH VERY LITTLE FORCE, remove the end of the fob..(chrome end) and should have 2 batteries I believe...if you dont have the chrome key message me, I can talk you through the other type also, but all have the basic concept.....

Hi If I'm changing just the shell of 2000 clk do you know if there is anything I need to do besides place the medal key in it? And do you know if all key shells are compatible? Thanks Pam Dixon