When I had one after a year the health was still at 99 then I got the s7 2022. It was new in 2021 when I got it. I’m guessing it’s because there is less sensors/ advanced sensors for heart rate and all that stuff. Less stuff running in the background. It had a better battery tbh then my s7 but my old one was a 44mm

I would expect that it’s a bug and will likely drop pretty quickly. or stay incorrect at 100. not even an unused 3 would be at 100 due to a long term drained battery.