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
5 YR Old Gear S3 Frontier vs Brand New G4 Classic Battery Life : r/GalaxyWatch
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Amazon.com: [400mAh] Battery for Samsung Gear S3 Frontier (SM-R760, R770, R765) Gear S3 Classic Replacement Battery EB-BR760ABE GH43-04699A with Professional Repair Tools Kits : Cell Phones & Accessories
Buy Original Replacement Battery EB-BR760ABE For Samsung Gear S3 Frontier Classic R760 R770 R765 380mAh at affordable prices — free shipping, real reviews with photos — Joom