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CELLONIC® Battery Replacement for Sony MDR-RF811RK, MDR-RF855RK, MDR-RF810R, MDR-RF811R Wireless Bluetooth Headphones Headsets 700mAh BP-HP550-11 Spare Accu Pack: Amazon.co.uk: Electronics & Photo
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Sony MDR-XB950B1 & MDR-XB950BT Teardown Battery Replacement/Repair - YouTube
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How to Replace the Battery on the Sony Noise Cancelling Headphones - MDR-ZX110NC - YouTube
