
You'd usually hope that software updates would improve the workings of your device, but it looks like the latest version of iOS, 16.4, does just the opposite. Users report that battery life has worsened after the update, and the phenomenon has been tested and subsequently confirmed by the Youtube channel iAppleBytes. If you're still yet to receive the update, then it looks like you may want to hold off for now.
The update was released on March 27th, and the devices affected seem to be the iPhone 13, 12, 11, and XR.