Apple's iOS 11 has been available for more than a month now, but some users have apparently been complaining of much reduced battery life after installing the new operating system.
Already running on over 52 per cent of supported iPhones and iPads, iOS 11 brings a number of new capabilities., including security enhancements. However, it's believed that these advancements are taking their toll on the iPhone.
The claims have been backed up by research by mobile security company Wandera.
The news comes as iPhone and iPad users have reported other issues, including installation lags, slow speed and connectivity issues. Faster battery drain is the latest to emerge.
According to Wandera, battery drain is a common problem experienced by iOS users, especially after major iOS upgrade releases. And iOS 11 is the latest. "This is partly due to Spotlight re-indexing and other behind the scenes shuffling," it explained.
New features, such as Animoji and iPhone X's FaceID, make use of face-scanning technology, which Wandera believes is the main cause of the battery-life issues.
"The hardware enabling this advanced facial recognition (A11 Bionic GPU) in the iPhone X could be the reason there is such a dramatic difference in battery decay rate," the company claimed.
"We also suspect it is a case of Apple fans wanting to test out all the shiny new features right off the bat. We all know it's hard to resist.
"Your individual battery stamina will also vary depending on what you have installed on your device and what model you have. So not everybody is experiencing the same frustration.
"However, we were able to draw some general conclusions on how bad this reported iOS 11 battery drain actually is."
Updating to the latest version of software is crucial in terms of security, but Wandera has found that some users have been downgrading in light of the battery issues.
"It's important for businesses to keep their mobile devices running on the latest OS version to protect them from threats. So when we heard that people were downgrading back to iOS 10.3.3 or reluctant to upgrade to 1OS 11 in the first place, we wanted to see why.
"We looked at a subset of 50,000 moderate to heavy iPhone and iPad users in our network running iOS 10 and iOS 11 to compare the average battery decay rate over the past three days.
"The current estimate is 240 mins for iOS 10 and 96 mins for iOS 11. In other words, we can assume the average decay rate for iOS 10 is 0.006958 percent per second and for iOS 11 it's 0.01739 percent per second."
In terms of upgrade rates, the company found that 4.3 per cent of OS 10.3.3 users switched to iOS 11 within 24 hours of it being released. However, of the Apple devices running on its network, only 2.98 per cent are using iOS 11.
"This leaves a huge percentage of users running out of date software exposing themselves and their organizations to risk," the company added.
"If you find the battery drain on iOS 11 too much to tolerate, you might start thinking about a switching back to iOS 10.3.3. While this may be tempting, we strongly advise against it.
"The more up to date your software, the more protected you are from hackers attempting to exploit your device and infiltrate your personal and corporate data."
Ian Hughes, an analyst at 451 Research, said: "Powering devices, and ensuring an efficient use of that power, is a complex problem.
"In consumer devices, such as smartphones and tablets there is a wide range of usage profiles and there are ever updating applications seeking to give new function.
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