probably somewhere the contact has departed, and it does not allow the battery to charge. contact the service center
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Here are some additional resources for people in the future:
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* [https://www.ifixit.com/Wiki/SoundLink_Mini_Won%27t_Turn_on_When_Connected_to_Power|If your speaker doesn’t turn on even when connected to power]
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* [https://www.ifixit.com/Wiki/SoundLink_Mini_Won%27t_Turn_On_When_Using_Battery|If your speaker only doesn’t work when you try to use battery power] (a.k.a. the battery isn’t charging)