Perhaps following the same 80% rule for charging EVs, Apple has implemented an option to hard limit the battery capacity of the iPhone 15 and iPhone 15 Pro to 80%.
In response to a question from MacRumors writer Joe Rossignol during our iPhone 15 Pro Q&A, our reviewer Allison Johnson listed off the options from their charging menu, including one clearly labeled “80 percent limit,” which you’d think would mean a hard stop to reduce wear and tear on the battery. However, in our testing so far, the new phones still don’t always stop charging once they reach 80 percent, even with the setting enabled. We’ve contacted Apple about the behavior and are doing some more tests we’ll let you know what we find out.
Apple added a feature for the iPhone 15, and this is to stop it from charging past 80%. In a confirmation earlier today from reports, Apple has included a new feature to the iPhone 15 series' battery health, which would only charge the device up to 80 percent.