Battery Health 97% after 8 months use

That is a great score for an 8 month old phone.

Apple recommends replacing the battery when it reaches 80%.

Your warranty only covers a battery that falls below 80 percent in one year. Most newer phones battery replacement is around $70. https://www.apple.com/batteries/service-and-recycling/

That’s higher than I would expect. I’d say around 90-92 percent at 8 months