Samsung Gear S3 Classic and Frontier: Extend Your Battery Life with These Battery Saving Tips - YouTube
5 YR Old Gear S3 Frontier vs Brand New G4 Classic Battery Life : r/GalaxyWatch
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