Amazon.com: Sennheiser Consumer Audio CX 6.00 BT Wireless in-Ear Headphones, Bluetooth 4.2 with Qualcomm Apt-X, 6-Hour Battery Life, 1.5 Hour Fast USB Charging, Multi-Connection to 2 Devices, Black : Electronics
Original Replaces AHB471233PST Battery For Sennheiser CX 7.00BT Momentum In-Ear Wireless Bluetooth Earphone AKKU - AliExpress