2x Battery For Sony WF-1000XM4 WF-1000XM3 WF-SP900 Headset Headphones Z55H CP125
For SONY WF1000XM4 WF-SP900 Headphones. Usage: Bluetooth Headset. Remove the old battery, carefully install the new battery on the battery box, tighten the screws, and then connect the wires of the new battery.