Amazon.com: 1000mAh Replacement Battery for Sennheiser PXC 550 II Noise Cancelling Wireless Bluetooth Headphones : Electronics
Sennheiser PXC 550 Wireless Review - RTINGS.com
Sennheiser PXC 550-II Wireless - NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life (508337) - Newegg.com
audio devices: Sennheiser PXC 550-II: Impressive battery and good ANC - The Economic Times
I recently bought PXC 550 ii, this is the second time I charge it, it's been more than three hours already and the third led is still blinking (internet says full charge