To resolve the issue of AllMyBatteries displaying an outdated iPad battery percentage, follow these actionable steps:

1. Force Close the AllMyBatteries App:
- Swipe up from the bottom of the screen (or double-click the Home button on older devices) to open the app switcher.
- Find the AllMyBatteries app and swipe it up to close it completely.

2. Restart Your iPad:
- Press and hold the power button until you see the "slide to power off" slider.
- Slide to turn off the iPad.
- After it powers down, press the power button again until you see the Apple logo.

3. Check Bluetooth and Connectivity:
- Ensure that your iPad is connected to Wi-Fi or cellular data.
- If AllMyBatteries tracks other devices via Bluetooth, make sure Bluetooth is enabled (Settings > Bluetooth), and that the connected devices are powered on.

4. Ensure App Permissions Are Enabled:
- Go to Settings > AllMyBatteries and confirm that necessary permissions are granted (especially access to Bluetooth and location, if applicable).

5. Update the App:
- Open the App Store, tap on your profile at the top right, and check for updates. Ensure that AllMyBatteries is up to date.

6. Reinstall AllMyBatteries:
- If the issue persists, consider uninstalling and reinstalling the app:
- Tap and hold the AllMyBatteries app icon until it shakes.
- Tap the "X" or "Remove App," then confirm the deletion.
- Reinstall it by searching for AllMyBatteries in the App Store.

7. Calibration Check:
- If the battery percentage remains unresponsive, the iPad may require battery calibration. Allow the battery to completely discharge until the iPad turns off, then charge it uninterrupted to 100%. This can help recalibrate internal battery readings - learn more - learn more.

8. Contact Support:
- If none of the above steps solve the problem, it might be useful to reach out to the AllMyBatteries support team or consult the Apple Support Community for further assistance - learn more.

By following these steps, you should be able to refresh the battery percentage displayed by AllMyBatteries on your iPad.