iPhone owners say iOS 15.4 is causing serious battery drain

This week, Apple rolled out iOS 15.4. If you have a supported device, you can download the new software update right now. The update is packed with great new features, including the ability to unlock an iPhone with Face ID while wearing a mask. But as with any new software, some users are running into issues after updating. Ever since iOS 15.4 launched on Monday, iPhone owners have been taking to Twitter to complain about battery drain.