Benchmark testing of nine different iPhone models shows that less than half of them experienced any improvement to battery life from the recent iOS 15.4.1 update, despite Apple describing that as a major feature of the new version. More of the handsets saw a decrease instead.
On the devices affected, the drop in battery life is generally small, but it’s nevertheless likely to leave some iPhone users holding off on the update. Which is unfortunate, as iOS 15.4.1 also closes a security hole that Apple says has been actively exploited.