Product Description:Battery Capacity : 3.7V 55mAh 0.2WhReplacement Battery Model: CP1254 A3 Compatable with :Sony WF-1000XM3 Wireless Noise-Canceling HeadphonesSony WF-1000X Wireless Noise-Canceling HeadphonesSony WF-SP700N Wireless Noise-Canceling Headphones for SportsSony WF-XB700 EXTRA BASS True Wireless Earbuds HeadphonesSony WF-SP900 Sports Wireless Headphones Package include:2 x CP1254 A3 Battery