Will updating to iOS 15.2 reduce iPhone battery life?

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Tested on 9 models including iPhone 13

Following the operation speed verification of the iPhone with iOS 15.2 installed released on December 14, Japan time, a video verifying the battery life , published by the YouTube channel iAppleBytes. The iPhone used in the test and the battery capacity compared to the new one are as follows.

The iPhone used for the test turned off the automatic adjustment of the screen brightness and set the screen brightness to 25%. Comparing time to zero and battery score. After updating iOS, battery consumption will increase for a few days due to internal data optimization. It is generally said that it takes about a week for the battery consumption to settle down, but iAppleBytes conducted a test without waiting for a week, saying that the battery consumption will settle down 3 days after the update.

Battery score drops for each iPhone model

Battery test results are as follows.

Here is a graph that summarizes the battery score of each tested model by iOS version. Both iPhone SE (1st generation) (left) and iPhone 6s have lower scores in iOS15.2 than iOS15.1, and the score drop is particularly noticeable in iPhone SE (1st generation). iPhone7 (left) and iPhone8 also have slightly lower scores for iOS15.2 than iOS15.1. The iPhone XR (left) is the only model tested this time, and the battery score improved from 2,994 to 3,043 from iOS 15.1 to iOS 15.2. For the iPhone SE (2nd generation), iOS 15.1 testing has ended in the middle, so please see it as a reference value. This is the first battery test for iPhone12, and the iPhone13 has not been tested with iOS15.1, but the drop in score is noticeable from the previous test of iOS15.0.2 of 5,870 to iOS15.2 of 5,090.

Is iOS 15.2 disadvantageous in terms of battery life?

iAppleBytes, who released the battery test video, commented that iOS15.2 doesn't seem to have a very good battery life. Especially on iPhone13, he said that he was surprised that GeekBench 4's battery score dropped by 780 compared to iOS15.0.2. Nonetheless, the iPhone 13 has a battery score of 5,090, which greatly exceeds other models. The channel concludes that if battery life is important, updating to iOS 15.2 may be postponed. Watch the iAppleBytes battery test video here. Source: iAppleBytes/YouTube(hato)

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