Amazon.com: AOLIKES 750mAh Replacement Battery for Bose QC35 QC45 QuietComfort 35 II Wireless Headphones, Compatible with Sony WF-1000XM3 WF-SP900 Charging Case Battery : Electronics
Amazon.com: SPANN Battery Replacement for Bose Bluetooth Headset Series 1, Bluetooth Headset Series 2, BTL1, BTL2, BTR1, BTR2, Part No: AHB501220P 3.7V : Electronics
Amazon.com: FOUNCY Battery Replacement for Bose Part NO: AHB501220P, Bluetooth Headset Series 1, Bluetooth Headset Series 2, BTL1, BTL2, BTR1, BTR2 : Electronics
How to change the battery on the Bose QC25 headphones - YouTube