Here's a temporary Gear S3 battery fix that also works with the Gear Sport - SamMobile
Samsung Gear S3 Software Update Reportedly Causes Battery To Drain Fast
Samsung Gear S3 battery drain bug returns for some users - 9to5Google
So after I updated to the latest firmware I got extreme battery drain like from 100% to dead within an hour even after replacing the battery. HR sensor is dead wont turn
Why is my Samsung S3 battery draining so fast?
Here's the temporary fix to the Gear S3 and Gear Sport battery drain issue
How to Fix a Gear S3 Battery Drain
Samsung Gear S3 Frontier Review: Why It's (Almost) the Best Smartwatch | Tom's Guide
Fix for Samsung Gear S3 battery drain issue begins rolling out - GSMArena.com news