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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
700mah Ahb413645pct Battery Wireless Bluetooth Headset For Sennheiser Pxc 550 Battery Ahb413645pct+usb Cable+toolkit - Mobile Phone Batteries - AliExpress
Losoncoer High Capacity Battery 1400mah Wireless Bluetooth Headset For Sennheiser Pxc 550 Battery Ahb413645pct - Digital Batteries - AliExpress
New 700mAh Li Ploymer AHB413645PCT Replacement Battery For Sennheiser PXC 550 Accumulator Batterie 3 wire Plug +tools|Mobile Phone Batteries| - AliExpress