The Battery API makes a nice addition to the WP8 SDK.

I can see in the near future that some applications will display the battery metrics on a Live Tile or in the application that hides the System Tray.

The Battery API is pretty easy to use:

1- Get the Battery instance with Battery.GetDefault().

2- Bind to the event RemainingChargePercentChanged.

The battery properties are:

- RemainingChargePercent: gets a value that indicates the percentage of the charge remaining on the phone’s battery.

- RemainingDischargeTime: gets a value that estimates how much time is left until the phone’s battery is fully discharged.

With the following code:

using Windows.Phone.Devices.Power; namespace BatteryApp { public partial class MainPage { private readonly Battery _battery; public MainPage() { InitializeComponent(); _battery = Battery.GetDefault(); _battery.RemainingChargePercentChanged += OnRemainingChargePercentChanged; UpdateUI(); } private void OnRemainingChargePercentChanged(object sender, object e) { UpdateUI(); } private void UpdateUI() { textBlockRemainingCharge.Text = string.Format("{0} %", _battery.RemainingChargePercent); textBlockDischargeTime.Text = string.Format("{0} minutes", _battery.RemainingDischargeTime.TotalMinutes); } } }

You get:



Please note that when running this on the emulator, it will show 100% and an infinite discharge time. The above values are fake.

Get ready to code!