Apparently, in iOS 11.4 for older devices really have problems with autonomy. But they are not in beta versions of iOS 12.
At the official Apple forum, there were a lot of reports about the abnormally fast depletion of the iPhone running the operating system iOS 11.4. They began to write in early summer – in mid-June, there were only a few complaints. Now, according to the publication 9To5Mac, the forum is about 33 pages (15 records on one) with user messages about a significant decrease in battery life.
Based on the majority of complaints, the overall picture of the problem is pretty clear: iOS 11.4 significantly reduced the battery life of the iPhone 6 and 6s. Users are sure that the batteries of their smartphones have become excessively quickly discharged just after installing a fresh version of the operating system. The reason is still unclear. According to one of the forum participants, 50% of the charge of the battery “takes away” the modem mode (the function of distributing the mobile Internet via Wi-Fi via the smartphone) – at least according to the integrated function of tracking battery consumption. But the user assures that the “access point” is turned off. Apparently, in iOS 11.4 for older devices, there is a bug where modem mode is constantly active – but these are only assumptions.
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If you believe unofficial reports on the same forum, in iOS 12this problem is fixed. Apple does not comment on numerous complaints. It is hoped that iOS 11.4.1 will fix the problem with excessive battery consumption, and the owners of old smartphones will not have to wait for the release of the upcoming version of the operating system (release is scheduled for autumn).
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