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
LCLEBM 520mAh Battery for Samsung Gear S3 Frontier India | Ubuy
Amazon.com: WUHAO Battery for Samsung Gear S3 Frontier SM-R760 SM-R760N SM-R765 SM-R765T,Gear S3 Classic SM-R775T Replacement Battery, EB-BR760ABE for GH43-04699A Battery with DIY Repair Tools : Cell Phones & Accessories
LCLEBM 520mAh Battery for Samsung Gear S3 Frontier India | Ubuy