It is the same for my “week 1” iPhone 11 Pro.
Btw it is very funny that people can complain about something working too well 😂
the battery health indication is just... an indication. And not even a very accurate one.
Your battery surely isn’t as good as it was when brand new, but most probably it is aging well. In a few months the indicator will show something like 95% and you will ask “the battery went from 100% to 95% in a week, is it normal ?”. 😂
enjoy your phone and forget about the battery health for a while.
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My iPhone X is currently at 82% max capacity. I got it in December 2017. That's 2 years and 5 months (891 days). That's an average of about a 0.02% drop per day.
If that drop % starts at day 1, you would currently be around 95.28% max capacity. However, I'd say that the drops don't happen as fast during the first year of life. It's only after the cells have been charged and recharged over and over for a while that things begin to wear.
On top of this, you have an iPhone 11. The battery life of that phone is way better than my iPhone X. I don't know how much the battery itself is improved, but iOS battery management has improved significantly. It makes sense to me that you haven't seen much of a drop in max capacity over the past 7 months.
Battery health doesn’t drop in a linear way, so it is pointless to find a percentage per day ratio.
By the way, at 82% your battery is quite ruined, at it could die the next day. I would ask for a replacement.
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I use coconut battery app (I think you have to buy, not the free one, to get access to devices in addition to the Mac it runs on), and I am pretty sure it fluctuates some. I just checked, and note mine is showing a full charge capacity in excess of the design capacity of the phone.
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Coconut is a very good app, but it still relays on the phone’s sensor for the battery, so it isn’t very accurate and it can fluctuate a bit.
The only accurate way to test a battery is to remove it and use a bench tester. Not very practical.