A:AnswerHi 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
A:AnswerHi Hannah, the Bose QuietComfort Ultra Headphones (2nd Gen) are crafted with premium materials for exceptional comfort and a refined design, allowing you to immerse yourself more deeply in your favorite music and video content. They’re engineered with our best noise cancellation and spatialized audio for a truly immersive listening experience. Every note feels fuller, every piece of dialogue becomes clearer, and every melody takes on greater depth.
We’ve also improved the noise‑cancelling performance to deliver an even better listening experience overall.
Jelyn - Bose Customer Support