Check battery status.

BatteryStatus.cs

using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows.Forms;

public class BatteryStatus : INotifyPropertyChanged
{
  public BatteryChargeStatus BatteryChargeStatus => SystemInformation.PowerStatus.BatteryChargeStatus; // Flag

  public int BatteryFullLifetime => SystemInformation.PowerStatus.BatteryFullLifetime;

  public float BatteryLifePercent => SystemInformation.PowerStatus.BatteryLifePercent;

  public int BatteryLifeRemaining => SystemInformation.PowerStatus.BatteryLifeRemaining;

  public PowerLineStatus PowerLineStatus => SystemInformation.PowerStatus.PowerLineStatus;

  public bool BatteryIsCharging => BatteryChargeStatus.HasFlag(BatteryChargeStatus.Charging);

  internal void Update()
  {
    RaisePropertyChanged(nameof(BatteryChargeStatus));
    RaisePropertyChanged(nameof(BatteryFullLifetime));
    RaisePropertyChanged(nameof(BatteryLifePercent));
    RaisePropertyChanged(nameof(BatteryLifeRemaining));
    RaisePropertyChanged(nameof(PowerLineStatus));
    RaisePropertyChanged(nameof(BatteryIsCharging));
  }

  #region INotifyPropertyChanged

  public event PropertyChangedEventHandler PropertyChanged;

  private void RaisePropertyChanged([CallerMemberName] string propertyName = null)
  {
    var handler = PropertyChanged;
    if (handler != null)
        handler(this, new PropertyChangedEventArgs(propertyName));
  }

  #endregion
}