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
Fix for Samsung Gear S3 battery drain issue begins rolling out - GSMArena.com news
Samsung Gear S3 Frontier Smartwatch 46mm Stainless Steel Verizon Dark Gray SM-R765VDAAVZW - Best Buy
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Samsung Gear S3 tips and tricks: Get more from the Classic and Frontier