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Replacement Ear Cushions for Bose Quiet Comfort 35 (QC35) and QuietComfort 35 II (QC35 II) Headphones. Complete with QC35 Shaped Scrims with 'L and R' Lettering (QC35/QC35 II Ear Pads, Black) :
Tutorial How To Repair Replace Bad Battery Bose Quietcomfort QC35 - YouTube
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