See here:
http://www.surfaceforums.net/threads/psa-surface-book-keyboard-manual-release.20728/
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The detach button doesn't work for my surface book and it's battery is dead. Is there any other manual way to detach the keyboard?
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Answer accepted by question author
Hi Nikhil,
To better assist you further with the detaching of your keyboard from a Surface Book with a dead battery, we suggest that you contact our Assisted Support.
Regards.