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
Best Airpods Apps for Android to Get iPhone Like Experience - TechWiser
AirDroid | An AirPod Battery App for Android - Download | Cafe Bazaar
AirBuds Popup - airpod battery app – Apps on Google Play
AirBattery - Apps on Google Play
These apps shows remaining battery on AirPods when connected to Android - GSMArena.com news
Bluetooth Battery Reader | AirPods battery for Android - APK Download
These apps shows remaining battery on AirPods when connected to Android - GSMArena.com news
DroidPods - Apple Airpods app now available for download on Android ! Download our app from Google Play store and be aware of your Airpods battery status all the time! http://play.google.com/store/apps/details?id=com.ctrls.alex.droidpods #DroidPods
How to check AirPod battery on Android phones - CNET
AirDroid | An AirPod Battery App APK for Android | mtauro
Airpods Battery for Android - Airpod Battery Level for Android - APK Download