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From ifixit is possible to purchase the replacement battery for 30$ https://www.ifixit.com/Store/Miscellanous/Bose-QuietComfort-35-Battery/IF388-004?o=1 https://www.ifixit.com/Store/Miscellanous/Bose-QuietComfort-... You could find a smartphone repair shop and ask them if they could do that repair with you providing them the guide and replacement component: https://www.ifixit.com/Guide/Bose+QuietComfort+35+Battery+Replacement/134337 https://www.ifixit.com/Guide/Bose+QuietComfort+35+Battery+Re...