2PCS CP1254 for Varta A3 3.7V 60 mAH Bluetooth Headset Wearable Battery
CP1254 (A3). Keep the battery away from fire. Never make the circuit short or squeeze the battery. Battery Capacity: 60mAh. Battery Capacity: 4000mAh. for the SONY WF-XB700, WF-SP700N, WF-SP900, WF-1000XM3 wireless earphones.