Battery Information


This article covers Uno-specific information for Windows.System.Power namespace. For a full description of the feature and instructions on using it, consult the UWP documentation:

  • You can use the Windows.System.Power.PowerManager class to query the battery and charging status of the device and subscribe to the related events when these change.



  • ✔ Supported
  • ✖ Not supported
Picker UWP/WinUI WebAssembly Android iOS macOS WPF GTK
BatteryStatus ✖ ️ ✖ ️
EnergySaverStatus ✖ ️ ✖ ️
PowerSupplyStatus ✖ ️ ✖ ️
RemainingChargePercent ✖ ️ ✖ ️
RemainingDischargeTime ✖ ️ ✖ ️
BatteryStatusChanged ✖ ️ ✖ ️
EnergySaverStatusChanged ✖ ️ ✖ ️
PowerSupplyStatusChanged ✖ ️ ✖ ️
RemainingChargePercentChanged ✖ ️ ✖ ️
RemainingDischargeTimeChanged ✖ ️ ✖ ️


For general usage you can follow the documentation provided by Microsoft.

Platform-specific requirements


For Android, there is one permission you must configure before using this API in your project. To do that, add the following to AndroidManifest.xml:

<uses-permission android:name="android.permission.BATTERY_STATS" />



RemainingChargePercentChanged event is not updated continuously as there is no API that provides such events. It is triggered by system Low and Ok battery state broadcasts only. The RemainingChargePercent property always returns the up-to-date value. For continuous monitoring you can set up periodic polling.


Before any of the properties/events of PowerManager can be accessed, the class needs to be initialized via a platform-specific InitializeAsync method:

#if __HAS_UNO__
var isAvailable = await PowerManager.InitializeAsync();

If the returned value is false, refrain from using PowerManager in your code, as it is not available in the browser the user is using.