I just bought an iPhone 11 Pro last year September. Then after two months (November 2019) of using, my iPhone 11 Pro's battery health dropped until 95% with normal using (one day one charge). Then I went to Apple Authorized Shop to repair. After a few days, Apple changed a new iPhone 11 Pro with different IMEI number. Then after another two months of using, now my new iPhone 11 Pro's battery health again dropped to 96%. I was wondering what is the problem? I understand that battery is kind of a degrading stuff following by the days of using. Is it the 18W fast charger hurt battery? FYI, I had been using Apple's product for few years. My last iPhone SE does not have this kind of problem. Anyone can suggest? And can anyone tell me how much is yr iPhone 11 Pro battery health? Thank you very much.