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Using the iOS Shortcuts app, you can set up an automation that announces your phone's battery percentage every time you put your AirPods in. Simply create a shortcut that retrieves and vocalizes the battery level, then set this to trigger upon connecting to your AirPods.
Enhancing Audio Quality
If you wish to boost bass or modify audio output, head to the settings of the Apple Music app to turn on the EQ options. You can select presets like "Increase Bass" or create a custom audio setup under Accessibility. There you can undergo an audio test that tunes your AirPods to your preference.