How to make a simple battery?

I have a timer script counting down and I need to make an object with a script so that when you press E on it, it will destroy the object and add 30 seconds to the timer.

This is my timer script: var timer : float = 30.0; var sound: AudioClip; var camera1 : Camera; var camera2 : Camera;

 var CameraSwitch : CameraSwitch;
 
 function Awake(){
 
 CameraSwitch = GameObject.Find("camHolder").GetComponent("CameraSwitch");
 
 }
 
 function Update()
 {
     timer -= Time.deltaTime;
     
     if(timer <= 0)
     {
         timer = 0;
         audio.PlayOneShot(sound);
         camera1.gameObject.SetActive(true);
         camera2.gameObject.SetActive(false);
         CameraSwitch.Playsound();
         }
 }    
     
 function OnGUI()
 {
     GUI.Box(new Rect(155, 100, 75, 23), "Battery: " + timer.ToString("0"));
 }