I recently bought an IPhone 8 on September 1, 2018 and just today, November 10 2018, I checked my battery health and I saw that my battery maximum capacity is down to 98% - is that normal or should I be more concerned?
iPhone 5s, iOS 11.4.1
That is normal. Here is a link that offers information about battery life
For a mass produced device, not individually calibrated this is comfortably within tolerance. Battery capacity is notoriously difficult to measure so I would not expect better than about +/- 5% even under ideal conditions with laboratory grade testing. For a comparison my iPhone 6s Plus has been sitting unchanged at 92% for the last 18 months without any problems, and I suspect it has been like that from soon after I got the phone.
Maximum Capacity
