Amazon.com: 【500 𝒎𝑨𝒉】Battery for Samsung Gear S3 Frontier(SM-R760) and Gear S3 Classic, Upgraded Version Replacement Battery SM-R770, BR760, R765, EB-BR760ABE, GH43-04699A with Professional Repair Tools kit. : Cell Phones & Accessories
Samsung Gear S3 Battery
For Samsung Galaxy Watch 46mm Gear S3 Frontier Classic Battery Tools Set | eBay
Just replaced my Gear S3 battery (24$ + 10$ for tools). Excited to get 3+ days back. Links in comments, will report back with new battery life in a few days. : r/GearS3