If you're using your Airpods with an Android device, you should check out the AndroPods app, it allows you to see your Airpods' charge levels from the notification panel and also via
Using APPLE AIRPODS on ANDROID (Apple Airpod 2 Review) - YouTube
Zo werken Apple AirPods op Android-toestellen via bluetooth
How to Connect AirPods to an Android Phone | PCMag
TicPods 2 Pro: Still a solid Android alternative to Airpods - 9to5Google