iPhone 16 battery health good or bad

hi everyone. i got my iphone 16 back in march with the manufacturing date being in january. up until the end of august, my battery health stayed at 100%. fast forward to now where it is at 91% and only has 160 charging cycles which means it’s going down 1% per week. i’m confused on how this is happening so quickly because with all of my previous iphones (6s, xr, 13) they all took 3 years to get down to that percentage and i am using this phone as much as i did with my previous ones and doing the exact same things with it too (like screen time and charging amount).

does this mean my iphone battery is bad? am i able to get it replaced before it hits 80%? i’m getting concerned.