Review: Sennheiser's PXC 550 Wireless Headphones Should Put Bose on Notice - MacRumors
Sennheiser PXC 550-II review: Great sound and ANC - SoundGuys
Sennheiser's new PXC 550 wireless headphones are rated for 30 hours on a single charge - The Verge
New Battery for Sennheiser PXC 550 Headset Li Po Polymer Rechargeable Pack Replacement 3.7V 700mAh AHB413645PCT 3 Lines+Plug|Digital Batteries| - AliExpress
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