New AHB521630 3.7V 240mAh Li-Polymer Battery For Logitech H600 Bluetooth Headset 3-wire Plug - AliExpress
Amazon.com: Cameron Sino New Replacement Battery Fit for Logitech A-00031, G Pro Wireless, G304, G502, G703 Lightspeed, MX Vertical, UE310, UE3500, UE4500, Wireless Headset H600(180mAh / 0.67Wh) : Electronics