Battery iPhone 7
iphone 7 one year old shows maximum battery capacity 88% and supports peak performance. Is this a concern?
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Apple's rating is for 80% health after 500 complete charge/discharge cycles. What you have is not unusual after one year if you assume a linear progression. It's also only an estimate.
That being said, I got mine replaced last December. It's got about 130 cycles and is reporting 99% battery health. Whether or not this is going to last I don't really care. If it makes it to 80% by the time it gets to 500 cycles, I'm not going to worry that the progression of that number somehow "got worse"