I had similar issues with my new Gear sport that i bought just recently. What i ended up doing is a factory reset. I also made some modification the some setting such as turning off the wake up gesture gesture. My location is always on. I went from getting 1.5 day to about 4 days after the reset and turning off the wake up gesture. If your watch is less then 1 year old i would contact samsung if that doesnt resolve the issue. I would hope they can help you.
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