Amazon.com: 1000mAh Replacement Battery for Sennheiser PXC 550 II Noise Cancelling Wireless Bluetooth Headphones : Electronics
Amazon.com: SENNHEISER PXC 550-II Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life, Black : Electronics
Amazon.com: Sennheiser PXC 550 Wireless – NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life : Electronics
Battery AHB413645PCT For Sennheiser PXC 550 Bluetooth Headset | eBay