When one Airpod is used and the case is closed, the battery widget shows depleted battery (red) icon

Greetings Kris Willms,

Does this issue remain if you remove that widget and add it back?

How to add and edit widgets on your iPhone

"How to remove widgets 

1. Touch and hold the widget that you want to remove.
2. Tap Remove Widget.
3. Tap Remove again to confirm."

"How to add widgets to your Home Screen 

1. From the Home Screen, touch and hold a widget or an empty area until the apps jiggle.
2. Tap the Add button  in the upper-left corner.
3. Select a widget, choose a widget size, then tap Add Widget.
4. Tap Done.

To add widgets from Today View:

1. Touch and hold a widget until the quick actions menu opens.
2. Tap Edit Home Screen.
3. Drag the widget to the right edge of the screen until it appears on the Home Screen.
4. Tap Done."

Take care.

Thanks for following up with us Kris Willms,

So we can look into this further, please use the following link to check for contact options to reach us directly: Apple Support

Take care.