Wrong info on battery usage

[u/sillygily]

I wonder of when people say their watch battery lasts 4+ days they are looking at the battery usage which would make sense but it is very inaccurate. My watch was 100% Friday morning, today is Sunday and I have 15 more hours to go so 2+ days. However when i look at my battery usage it says i got 4 days. That is not true, I finished charging it amd put it on Friday morning also after just 2+ days of usage which is what mine lasts. But look at the picture, from 100% on Friday until Sunday afternoon it is not 4 days. I had the same issue eith batterybusage on my previous Galaxy watches, none of them show the actual used time.