Hashtagtruth: I got my iPhone 7 on the 21st of September 2016 and it has 97% battery capacity remaining.. is that pretty good for a phone almost 2 years old? I plan to have the battery replaced by the end of the year before the price of replacements goes back up.

 

My iPhone 7 Plus is as old as your iPhone 7, and my battery is at 83%, so I would say your result is good.