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How long have you had them? If it was over a year you have to contact the company.
Sorry, there was a problem. Please try again later.Hi, ram, We are sorry to hear this. You may isolate this issue by following the guidelines here: http://helpguide.sony.net/mdr/zx220bt/v1/en/contents/TP0001176155.html If the life of the built-in rechargeable battery drops significantly or it cannot be charged anymore, the battery should be replaced by a service technician: https://esupport.sony.com/US/p/service.pl Regards, Vincent
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