New Battery for Sennheiser PXC 550 Headset Li Po Polymer Rechargeable Pack Replacement 3.7V 700mAh AHB413645PCT 3 Lines+Plug|Digital Batteries| - AliExpress
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
Ttvxo 620mah Wireless Bluetooth Headset For Sennheiser Pxc 550 Battery Ahb413645pct - Smart Accessories - AliExpress
Sennheiser PXC 550 Wireless – NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life
1000mAh Replacement Battery for Sennheiser PXC 550 II Noise Cancelling Wireless Bluetooth Headphones