Apple points out that the result might not deliver the True Tone experience that iPhone users are used to since True Tone calibration is done server-side, changes with each individual unit, and requires “accurate communication between a product’s display and light sensors.” The latter is something that can’t always be achieved when dealing with a component from a third-party manufacturer. If iPhone users aren’t happy with the capability of True Tone on a third-party replacement screen, the feature can be disabled.
![Battery Health metrics for the original battery powering an iPhone 15 Pro Max - Apple to give better support to third-party iPhone screens and batteries later this year](https://m-cdn.phonearena.com/images/articles/416339-image/batmet.jpg)
Battery Health metrics for the original battery powering an iPhone 15 Pro Max
At the same time, iPhone users with a third-party battery replacement cannot obtain figures such as maximum capacity and cycle count which are provided for the batteries that Apple includes with the iPhone out of the box. That’s because Apple can’t verify the figures as they apply to a third-party battery. Internal research conducted by Apple revealed that some replacement batteries sold by third parties are actually not new and have been previously used. The metrics that appear when testing these components are often faked to make them look as though they belong to a brand new battery.