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I brought a second hand garmin vivosmart 4 from cex. I fully charged it and it worked for about 10 hours then stopped working. Screen blank can't do anything with it. The battery was 3/4 full so it can't be that

It's graded as a b so should be in good working order. Not sure if I'm doing something wrong. My app is just saying it's not connected. How long is the battery meant to last?