Here's the temporary fix to the Gear S3 and Gear Sport battery drain issue
Amazon.com: [430mAh] Battery for Samsung Gear S3 Frontier(SM-R760) and Gear S3 Classic, (2023 New Version) Upgrade Replacement Battery for SM-R770, BR760, R765, EB-BR760ABE, GH43-04699A with DIY Repair Tool Kits : Cell Phones
Latest Gear S3 news - SamMobile
Samsung Gear S3 Frontier Troubleshooting - iFixit
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