I am on four years on my smartkeys, and have only changed them once on my 92 SEL, never on wifes.
The smart keys dont pry apart as the older ones do. You need to remove the metallic key, and push a release in the opening, and it slides out of the housing. Parts guys showed me!
Depending on the style, the older ones snapped apart (top and bottom) or had a cover that came off. The "smart key" electronic in my 01 E is as described above (it pulls out of the housing)after releasing the catch.
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