Samsung is pushing another Gear S3 update to take care of the battery drain - GSMArena.com news
Samsung Gear S3 Battery Life & Charger Options
Amazon.com: LCLEBM 520mAh Battery for Samsung Gear S3 Frontier (SM-R760),Galaxy Gear S3 Classic Replacement Battery for SM-R770,BR760,R765,EB-BR760ABE Gear S3 Battery with Professional DIY Repair Tools : Cell Phones & Accessories
Samsung Gear S3 Frontier Review: Why It's (Almost) the Best Smartwatch | Tom's Guide
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
Experiencing severe battery drain on your Gear S3 or Gear Sport? Try this temporary fix - PhoneArena
How To Increase Battery Life On Your Gear S3 - YouTube
Samsung Gear S3 update brings battery life improvement - SamMobile