Is it possible to use Custom EventArgs with SystemEvents?

My first post, apologies if this has been answered already - I have searched and searched but have not found any specifics on using Custom EventArgs with existing SystemEvents.

I am trying to take advantage of the SystemEvents.PowerModeChanged type events but would like to use my own Custom EventArgs instead of the standard PowerModeChangedEventArgs. My approach was to create a class called CustomPowerModeChangedEventArgs which inherits from PowerModeChangedEventArgs and use these instead but I don't know how to tell the PowerModeChangedEventHandler to use these new CustomEvent args. My code is as follows:

   //Define the custom args which inherit from the PowerModeChangedEventArgs
    public class CustomPowerModeChangedEventArgs : PowerModeChangedEventArgs
    {
       public string batterylevel { get; set; }
    }

   //event raising method with CustomArgs instead of the PowerModeChangedEventArgs
    protected virtual void PowerModeChanged(object source, CustomPowerModeChangedEventArgs e)
    {

    }

SystemEvents.PowerModeChanged += new PowerModeChangedEventHandler(PowerModeChanged);

The problem is with the PowerModeEventChangedHandler not accepting the method PowerModeChanged with the CustomArgs. Had it been a generic eventhandler I could define the args like...

public event EventHandler<CustomPowerModeChangedEventArgs> PowerModeCHanged;

...but I can't fathom how to achieve similar with a non generic event handler. I have a suspicion that it might be possible to send the new custom args to the handler using lambda expressions but I'm really not sure about this - maybe I need to define a whole new EventChangedHandler? Any advice would be greatly appreciated.