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# WKInterfaceDeviceBatteryState.unknown

An unknown battery-charging state.

```
case unknown
```

## Discussion

When the device’s [`isBatteryMonitoringEnabled`](/documentation/WatchKit/WKInterfaceDevice/isBatteryMonitoringEnabled) property is set to <doc://com.apple.documentation/documentation/Swift/false>, its [`batteryState`](/documentation/WatchKit/WKInterfaceDevice/batteryState) property is set to [`WKInterfaceDeviceBatteryState.unknown`](/documentation/WatchKit/WKInterfaceDeviceBatteryState/unknown).

---

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