WITHit Band Kit for Samsung Galaxy Watch 46mm, Gear S3, Gear S3 Frontier, and Fossil Sport Woven Black/Bluestone/Black 52374BBR - Best Buy
Samsung Gear S3 frontier (R765A) - Battery Life - AT&T
Samsung Gear S3 Frontier review: Outclassing most smartwatches in the market - SamMobile - SamMobile
Long Life 490mAh Battery for Samsung Gear S3 Frontier SM-R765A Watch EB-BR760ABE | 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