Observing or getting notified of change in battery state for watchOS

Is there any way to be notified of changes in battery state in real time without periodically checking for the state?

I tried finding an equivalent to UIDevice.UIDeviceBatteryStateDidChangeNotification available on iOS, but WKInterfaceDevice for watchOS doesn't seem to offer this Notification.

Even though the Apple doc specifies that classes in UIKit do not support KVO, and it is probably the same deal with WatchKit, I still tried registering an observer on WKInterfaceDevice.current().batteryState as follow, but it doesn't notify of changes

    WKInterfaceDevice.current().isBatteryMonitoringEnabled = true
    batteryObserver = WKInterfaceDevice.current().observe(\.batteryState) {
        [weak self] _, _ in self?.onBatteryStateChange()
    }

Does anyone know how to accomplish this without polling for the state periodically?

My solution was to make a custom notification from a singleton object that polls the battery state and level at regular intervals. If ever you have a better solution please share it with me, I'm not so fond of the polling part.

Here is the sample code for this