USPS 520mAh Battery For Sony WF-1000XM4 TWS Charging Case For Sony WF-1000XM4
Extended Charging Case BOX Battery 3.85V 520mAh For SONY WF-1000XM4 WF1000XM4. For WF-1000XM4 Charging Case. 1 x Extended Charging Case BOX Battery 3.85V 520mAh For SONY WF-1000XM4 WF1000XM4. Battery Capacity : 3.85V 520mAh 2.0Wh.