In order to unlock the mask, iOS 15.4 was upgraded immediately on the first day, and then all kinds of smells were really good, but the good times didn't last long. After one week, the battery health dropped from 100, which had been maintained for half a year, to 99. Personally, I feel that the fever and battery life of iOS 15.4 system declined in the first week, and it began to stabilize in the second week. All the data are still good, which is worth upgrading for iPhone 13 Pro users.

The nightmare began.

Then iOS 15.4. 1 was released. For me, this is a nightmare version, and it is not too much to be rated as the worst in history. Listen to me slowly.

On the day of upgrading iOS 15.4. 1, there was no case that "after updating iOS 15.4, the battery power consumption may be faster than expected", which was much worse than iOS 15.4. Can only say that it is a world of difference!

Power consumption

IPhone 13 Pro model, iOS 15.4. 1 takes at least 2 hours less than iOS 15.4.

Fever

Never mind the power consumption, a fever is a nightmare. When the battery of a mobile phone is about 30, it will be very hot, and it will burn when touched. When charging, you can't use the mobile phone at all, which will lead to more serious fever. Even when not charging, playing a LOL hand for two games will darken the brightness of the screen, making it completely unusable.

Battery health status

Normal use will also lead to a decline in battery health, there is no doubt about it, but the health of iOS 15.4. 1 is ridiculously high. After just two weeks of updating, the health dropped from 99 to 98, then to 97, and then to 96, with an average of more than one week 1.5%. Personally, it is estimated that fever is the main reason for the decline of battery health.

To sum up, in terms of personal experience, this version is a terrible nightmare version in history. I don't know how you went through it. I look forward to your comments.