Battery 3.8V 250mAh LiPo for Motorola MOTO 360 2 gen Smartwatch.
Battery For Motorola Moto 360 2nd Gen 42mm 46mm Sport Watch New Li-polymer Polymer Rechargeable Accumulator Replacement Track - Digital Batteries - AliExpress
Motorola Moto 360 Review | PCMag
Replacement Battery for Moto 360 2nd Gen Smart Watch -Alibaba.com