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Hi Andy, the Bose QuietComfort Ultra Headphones (2nd Gen) do not have a removable battery, so the battery cannot be replaced. It can only be charged using the USB‑C charging cable that comes with the product. If your headphones are experiencing battery issues, please feel free to reach out to us with your product’s serial number and your country location, and we’ll be happy to assist you further. You can reach us through this link: http://bose.life/globalsupport
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