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How do I fix a battery operated wall clock time is running away?

Wall clock was working great then started slowing down changed battery now time is flying what can I do to fix this
Sue laxton, March 2016
What kind of movement is it? If it is an electrically maintained balance wheel, the hairspring could have become crossed. If it is a pquarts electric meter movement, then it is probably a replacement job

clearer info needed, March 2016