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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
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Ttvxo 620mah Wireless Bluetooth Headset For Sennheiser Pxc 550 Battery Ahb413645pct - Smart Accessories - AliExpress
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100% New 700mah Ahb413645pct Battery Wireless Bluetooth Headset For Sennheiser Pxc 550 Battery Ahb413645pct - 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