for Sony Headset WF1000XM4 WF-1000XM4 battery 3.85 V,0.29 Wh/70 mAh,
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.