2pcs ZeniPower Z55H for Sony WF1000XM4 XM4 Bluetooth Headset Battery Z55H
SONY WF1000XM4 WF-SP900 Headphones. Keep the battery away from fire. Never make the circuit short or squeeze the battery. Battery Capacity: 70mAh. Battery Capacity: 4000mAh. We are always here ready for help.