Old iPhones: which version of iOS for the best battery life?
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Old iPhones: which version of iOS for the best battery life?

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iOS is updated every year by Apple to make it more efficient and less energy-consuming, but are the latest versions as durable as advertised?

Year after year, Apple has continued to improve the quality of the batteries and the endurance of its iPhones. By making the A-series chips ever more powerful, and ever less energy-consuming, Apple has been able to achieve more than respectable autonomy today, especially on the iPhone 13 Pro Max, which serves as a benchmark on the market.

Despite the addition of new features, the iPhone battery has never held a charge so well. But there is one variable that has not yet been taken into account: the OS. The operating system is often accused of draining the battery of phones, especially older generations. These models would be slowed down by a new update in order to make “planned obsolescence”.

6 iPhone 6s under 6 different iOS versions

In order to find out if this tenacious rumor from the world of Tech is based on a grain of truth, the YouTuber iAppleBytes decided to compare six iPhone 6s, all running a new version of iOS, and all equipped with a new battery in order to make the most credible test results possible.

After the initial calibration, he ran several performance tests to determine how much iOS versions can impact battery life. In this test, iAppleBytes compared iOS 10.3.3, iOS 11.4.1, iOS 12.4.1, iOS 13.7, iOS 14.7 and iOS 15.3.1.

To drain the battery faster, the YouTuber simulated a real use case, but pushed to the extreme of using very famous applications like Safari, Instagram, the mobile game Subway Surfer. He also took photos and videos with the phones’ front and back cameras.

It is with the old OS that we have the best autonomy

Finally, the test results are quite logical. The more we move towards advanced versions of iOS, the more efficient they are, and therefore consume more energy. If Apple is making efforts to make its parts as energy efficient as possible, it remains of very high quality and therefore requires a sizeable power supply.

The first version of iOS to have given up the ghost is finally iOS 14.7 which only lasted 4 hours and 15 minutes. Barely 20 minutes later, the iPhone 6s running iOS 15.3.1 ran out of power in turn. Finally, it is the older versions of iOS that are doing the best. iOS 12 thus approaches 5 hours while iOS 13.7 is 5:19 and iOS 10.3.3 5:34. The version of iOS which therefore seems to be the most economical according to this test would be iOS 11.4.1 which kept the ‘iPhone 6s on for more than 5 hours and 55 minutes.

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