Under “Battery Health,” my iPhone SE says only “Service” and gives none of the information listed here.

Well written and very useful instructions. Clearly, small hands and good eyes are very helpful in performing this surgery. I was surprised to discover, after completing the new battery installation, that my iPhone SE powered up with all of its memory intact. I was expecting it to require a re-install and had performed a backup of everything in memory immediately before beginning the battery replacement procedure.