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Stock Problems/IssuesDiscussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Clubman (R55), Cooper and Cooper S(R56), and Cabrio (R57).
Never had to do this myself, but whole key fobs can be bought cheaply from China (e.g. Aliexpress). You'd have to open up one such "spare" in order to use its button cover (assuming your key is fully operational). For opening up a key fob, search for Videos on the web about replacing the internal battery, e.g.:
Metal (or plastic, for that matter) outer rings can also cheaply be ordered from China. This I have done in the past for a family member's Mini fob, here's a picture of one such ring on his fob: