Battery Performance

From iPhone Battery and Performance:

A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions. The one-year warranty includes service coverage for a defective battery. If it is out of warranty, Apple offers battery service for a charge. Learn more about charge cycles.

Brad Purvis wrote:

Yes, I read that statement in the extensive article about iPhone batteries, however, it does not answer my question. Does the article imply the battery should be replaced when it falls below 80%?

And did you finish reading the extensive article about iPhone batteries? Cause under Battery Health paragraph, there is explanation when the battery will need to be replaced…