Go to Settings > Battery > Turn on Battery Percentage
How to Show battery percentage in the status bar
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How to Show album artwork fullscreen
Tap the small artwork to swap your Lock Screen wallpaper and widgets with a fullscreen version of the artwork of the song you’re listening to.
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10 New Features in iOS 16 You Should Know About
What's new in iOS 16: mark messages as unread, battery percentage, duplicate photo removal, haptic keyboard, and more