The iOS 15.4 update meets with reports of sudden-onset battery drain
Apple's latest version of iOS for its iPhones adds a number of long-awaited new and updated features. Now, however, a small number of its users have taken to Twitter in order to assert that installing the OTA in question has led to battery drain in their flagship devices.
Alex Kretzschmar (or @IronicBadger), for example, claims that his battery life dropped to "half what it was last week" on March 16, 2022, the day after the stable 15.4 version became official. Meanwhile, Maxim Shishko (or @lamaks_3) insists that screen-on time under the new update lasted for only 2 hours of using just 4 apps on an iPhone 11.
Finally, Oded Shopen (@odedia) claims that the newer 13 Pro Max (a top-end variant often linked to impressive endurance in these terms) had gone from lasting "days without charging" to losing half its capacity "by mid-day".
Then again, some replies to the same Twitter posts suggest that other users are not experiencing the same putative negative effects of iOS 15.4 - then again, some others concurred and asserted that their battery life on iPhones had also declined as a result of the update. Apple has yet to respond to this apparent new software issue at the time of writing.