Checking Battery Level in .NET MAUI

In .NET MAUI, you can check the device's battery level using the Battery class from the Microsoft.Maui.Devices namespace. Here's how to implement it:

Basic Implementation

1. First, add the necessary namespace to your file:

csharp

using Microsoft.Maui.Devices;

2. Get the battery level:

csharp

public double GetBatteryLevel()
{
    // Returns a value between 0.0 and 1.0
    return Battery.Default.ChargeLevel; 
}

Complete Example with UI

Here's a more complete example with a UI that displays the battery level:

csharp

using Microsoft.Maui.Controls;
using Microsoft.Maui.Devices;

namespace YourNamespace
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
            CheckBattery();
            
            // Optional: Subscribe to battery level changes
            Battery.Default.BatteryInfoChanged += Battery_BatteryInfoChanged;
        }

        private void CheckBattery()
        {
            var level = Battery.Default.ChargeLevel;
            BatteryLabel.Text = $"Battery Level: {level * 100}%";
            
            // You can also check other properties:
            var state = Battery.Default.State;
            var powerSource = Battery.Default.PowerSource;
        }

        private void Battery_BatteryInfoChanged(object sender, BatteryInfoChangedEventArgs e)
        {
            // Update UI when battery level changes
            MainThread.BeginInvokeOnMainThread(() =>
            {
                BatteryLabel.Text = $"Battery Level: {e.ChargeLevel * 100}%";
                
                // You can also check:
                // e.State - Charging, Discharging, Full, NotCharging, Unknown
                // e.PowerSource - Battery, AC, Usb, Wireless, Unknown
            });
        }
    }
}

XAML for the Example

xml

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="YourNamespace.MainPage">
    <VerticalStackLayout>
        <Label x:Name="BatteryLabel"
               Text="Checking battery level..."
               HorizontalOptions="Center"
               VerticalOptions="Center" />
    </VerticalStackLayout>
</ContentPage>

Important Notes

1. Permissions: On Android, you need to add the BATTERY_STATS permission to your Platforms/Android/AndroidManifest.xml:

xml

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

2. Platform Differences:

   • On iOS, you can only read the battery level (not write)

   • On Windows, this requires the "Power" capability

3. Battery State: You can also check:

   • Battery.Default.State (Charging, Discharging, Full, NotCharging, Unknown)

   • Battery.Default.PowerSource (Battery, AC, Usb, Wireless, Unknown)

4. Energy Saver: You can also check if the device is in energy saver mode:

csharp

var energySaverStatus = Battery.Default.EnergySaverStatus;