Only 12 days after updating iOS 15.1: Battery health dropped from 92% to 87%, iPhone XR suffered negative optimization

[[433946]]

It has been 12 days since the official release of iOS15.1. What changes have taken place during this period? Some bad news has come. Many Apple fans have reported that after upgrading to the official version of iOS15.1, the battery health has fluctuated significantly in just ten days.

For example, this netizen, after upgrading to the official version of iOS 15.1, in just less than 12 days, the battery health dropped from 92% to 87%, which is equivalent to a drop of 1% every two days - this speed is obviously abnormal, what is the problem?

Then, under this post, many netizens also shared their similar situations. I scrolled down and saw that some people's battery health dropped from 100% to 92%, some people's battery health dropped from 92% to 89%, and some people's battery health dropped only 1%.

This situation is basically faced by iPhone 12 users. In fact, this situation is normal. In the update description of iOS15.1, Apple mentioned one point: the battery health data of the iPhone 12 series will face recalibration. Apple fans who encounter similar situations do not need to panic, it will stabilize after a while.

Regarding the official version of iOS15.1, many Apple fans are more concerned about: After upgrading to the iOS15.1 system, what changes will there be in the fluency and battery life of old models? The measured data has been released, and the results can be simply summarized as: there is an improvement for the iPhone 11, but a negative improvement for the iPhone XR model.

This is the change in the running score of iPhone 11, as well as the change in the battery life level. It can be seen intuitively from the figure that the version with the best battery life is iOS13.4.1, and then it steadily decreases. The version with the worst battery life is iOS14.3, and then it steadily increases and gradually stabilizes.

Most importantly, the battery life of iOS15.1 is slightly better than that of the stable version of iOS15.0.2. At the same time, the CPU multi-core running score has increased from 3088 points in iOS15.0.2 to 3228 points.

But the iPhone XR is different. Although the CPU multi-core score has increased from 2458 to 2635, the battery life has dropped "precipitously". I can only say that if you have an A12 model, I strongly recommend that you do not upgrade to iOS15.1, as it may bring serious negative improvements.

In summary, the above are two new changes brought by the official version of iOS15.1: 1. The battery health of iPhone 12 has fluctuated significantly, so you need to be cautious when upgrading; 2. The multi-core performance of iPhone XR has increased by 7%, but the battery life has dropped "cliff-like". A12 users are advised not to upgrade to iOS15.1.

Have you upgraded to iOS 15.1? What changes have occurred after the upgrade? Welcome to discuss and share your valuable experience!