2Pcs 120mAh Li-ion Polymer Battery Varta CP1654-A2 Universal for Bluetooth Earbuds - Newegg.com
Cp1654 High Capacity 120mah Can Charge A3 Lithium Battery 3.7v Headset Lir1654 - Battery Accessories & Charger Accessories - AliExpress
VARTA CoinPower A4 Batteries Are Designed for the Future Development of Wearable and Mobile Devices VARTA Launches CoinPower A4 Batteries for Wearable and Mobile Devices
VARTA CP1654 with line rechargeable battery 3.7V Bluetooth headset battery 1PCS | eBay