Yes, it is possible to set up a notification system on your iPhone 13 that alerts you when your Apple Watch 7 and Nothing Ear(1) earbuds' battery falls below 20%. Here are the steps you can follow:
- Make sure that your iPhone 13 is updated to the latest version of iOS.
- Connect your Apple Watch 7 to your iPhone 13 via Bluetooth and make sure that they are paired.
- Open the Apple Watch app on your iPhone 13 and go to the "My Watch" tab.
- Scroll down and select "Battery".
- Toggle on the "Power Reserve" feature if it is not already on.
- Scroll down and select "Low Power Mode".
- Toggle on the "Low Power Mode" feature.
- Set the "Power Reserve" threshold to 20%.
- Make sure that notifications are enabled for the Apple Watch app on your iPhone 13.
- Repeat the same steps for the Nothing Ear(1) earbuds by connecting them to your iPhone 13 via Bluetooth and enabling low power mode in the settings.
Once you have completed these steps, you will receive a notification on your iPhone 13 when either your Apple Watch 7 or Nothing Ear(1) earbuds' battery falls below 20%. This will help you to keep track of your device's battery levels and ensure that you don't run out of battery while using them.