Coaxial ConnectorChina Dtp 301120 3.7V 40mAh Lipo Battery with Jst Phr 2.0 Connector Bluetooth Earphone Battery, Find details about China Bluetooth Earphone Battery, 3.7V Battery from Dtp 301120 3.7V 40mAh Lipo Battery with Jst Phr 2.0 Connector Bluetooth Earphone Battery