Watch only mode on the Gear S3 (and Gear Sport) can extend battery life by 40 days! - SamMobile
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Amazon.com: oGoDeal Replacement Battery for Samsung Gear S3 Frontier(SM-R760) and Gear S3 Classic 3.85V 380mAh Battery SM-R770,BR760,R765 EB-BR760ABE GH43-04699A Battery with DIY Repair Tools : Cell Phones & Accessories
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