Many fans upgraded to iOS 15.4 to experience unlocking the iPhone with a mask on, but I didn’t expect users to encounter a serious disaster after updating to iOS 15.4, and every version of the update will have a serious decline in iPhone battery life. Some iPhone 13 Pro Max users even said: “The battery life of such a large battery model can only last half a day,” while the iPhone 11 will use up 80% of the battery power within 24 hours, and the screen on time is only 2 hours.
A famous YouTuber conducted an iOS 15.4 battery consumption test on the iPhone 13, iPhone 12, iPhone 11, iPhone XR and older models, and the results are as follows.
In the iOS 15.4 battery consumption test, the iPhone 13 lasted 8 hours and 26 minutes, 8 minutes less than the iOS 15.3.1. The iPhone 12 lasted 22 minutes less on iOS 15.4 compared to iOS 15.3.1, for a total of 6 hours and 34 minutes.
It’s worth noting that older iPhone models have seen a relative increase in battery life when updated to the latest iOS 15.4 update, including the iPhone 6s, iPhone 7, and iPhone 8. On all of these older iPhone models, battery life has increased by 20 to 30 minutes, which is definitely a major leap forward compared to iOS 15.3.1.
The YouTuber concluded from this test that Apple’s latest iOS 15.4 has enhancements that improve battery life on older iPhone models.
