Iphone Xs battery capacity
Hi, I'd purchased my iphone Xs on November 2018 and I realized that my battery capacity drop to 99%. At that moment, I think it is normal until I found that the percentage drop 1% every month. Last checked on 25th Feb 2019 at apple service center was 97%, after 2 weeks which is 11th march 2019, it drops another 2%, 95% remaining. I have no idea what is the problem. Do you have any idea?
iPhone XS, iOS 12