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
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Some Gear S3 and Sport Users Reporting Massive Battery Drain Issues
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Samsung Gear S3 review: Stepping up a gear: Hardware, connectivity, contactless payments, battery life
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