Replacing the battery in your product - QuietComfort® 3 Acoustic Noise Cancelling® headphones
Amazon.com: 750mAh Replacement Battery for Bose QC35 QC45 QuietComfort 35 II Wireless Headphones, Compatible with Sony WF-1000XM3 WF-SP900 Charging Case Battery : Health & Household
Is the battery replaceable on Bose QC35 headphones? | Android Central
Replacement Battery Part for Bose QuietComfort 35 QC35 QC35 II Headpho