This app will tell you when your watch is fully charged.
You will also be alerted when the watch is unplugged from it's charging base before it has reached completion.
You can customize the LED color, sound, and if it vibrates for the notification.
You can also see the watch's current charge level on the notification dock while it is charging.
To allow this app to work properly, please make sure that the app has installed on both the watch and the phone. Then run the app on the phone for the first time to activate the app on the watch.
For Wear 2 devices, use a complication to keep track of your phone's battery level on your watch face.