iPhone users have taken to Reddit and Apple's forums to report massive battery drain issues on iOS 13.5.1 devices caused by Apple Music. The app's usage in the background is causing the issue.
Ios 13.5.1 RSS
Apple today released new security updates for iOS and watchOS, bringing the version numbers to 13.5.1 and 6.2.6, respectively. Apple hasn't documented what has been fixed just yet.