Replacing the battery in your product - QuietComfort® 3 Acoustic Noise Cancelling® headphones
Amazon.com: Bose QuietComfort 45 Bluetooth Wireless Noise Cancelling Headphones - Triple Black & S1 Pro Portable Bluetooth Speaker System with Battery, Black : Electronics
Amazon.com: QC3 Battery Charger fit Bose QuietComfort 3 QC3 Headphone Home Wall Power Supply Adapter US Plug : Electronics