Battery for Bose QC35 / QC35 II (Series II) Headphones, AHB110520 Replacement - Newegg.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 - Amazon.com