If you're on hn, you might not be opposed to replacing the battery yourself. Here's a teardown that exposes it [0]. It may be difficult to source a replacement

If you're on hn, you might not be opposed to replacing the battery yourself. Here's a teardown that exposes it [0]. It may be difficult to source a replacement battery, I would check aliexpress/ebay (usually better than mouser/digikey for these). At minimum, you would need some tiny screwdrivers and a soldering iron (battery wires soldered directly to board). [0] https://www.ifixit.com/Teardown/Bose+QuietComfort+35+PARTIAL+Teardown/114932 https://www.ifixit.com/Teardown/Bose+QuietComfort+35+PARTIAL...