I'm not sure how fast is, but this is one way (if you ask this?):

[DllImport("coredll")]
private static extern uint GetSystemPowerStatusEx(SYSTEM_POWER_STATUS lpSystemPowerStatus, bool fUpdate);

public class SYSTEM_POWER_STATUS
{
public byte ACLineStatus;
public byte BatteryFlag;
public byte BatteryLifePercent;
public byte Reserved1;
public uint BatteryLifeTime;
public uint BatteryFullLifeTime;
public byte Reserved2;
public byte BackupBatteryFlag;
public byte BackupBatteryLifePercent;
public byte Reserved3;
public uint BackupBatteryLifeTime;
public uint BackupBatteryFullLifeTime;
}

SYSTEM_POWER_STATUS status;
uint return = GetSystemPowerStatusEx(status, false);

I think the problem is that the form isn't visible. Try to use this to set focus on form:

[DllImport("user32.dll")]
private extern static IntPtr SetFocus(IntPtr hwnd);