For Samsung's Gear S3, size matters. And that's a problem - CNET
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Samsung Gear S3 Classic Smart Watch SM-R770 46mm GPS Bluetooth - Silver SR | eBay
Batteria da 450 mAh per Samsung Gear S3 Frontier (SM-R760, R770, R765), Gear S3 Classic Batteria di ricambio interna con kit di riparazione professionale : Amazon.it: Elettronica