I need help with my torch/battery pickup script!

I have a script here to run my torch, so it uses battery power when on and none when it is off:

 var lightSource : Light;
 var lightSourceDim : Light; // This is just another, larger, dimmer light I have in the same position on the flashlight as the other light
 static var lightEnergy : float = 200;
 static var turnedOn : boolean = false;
 private var drainSpeed : float = 1.0;
 
 function Start () {
 
 ToggleFlashLight(); // This is so it immediately starts draining energy from the flashlight
 
 function Update (){
 
 if (Input.GetKeyDown(KeyCode.F))ToggleFlashLight();
 
 }
 
 function ToggleFlashLight () { // To toggle the flashlight on and off
 
 turnedOn != turnedOn;
 
 if(turnedOn && lightEnergy > 0) {
 TurnOnAndDrainEnergy();
 }else{
 lightSource.enabled = false;
 lightSourceDim.enabled = false;
 }
 
 }
 
 function TurnOnAndDrainEnergy () { // To make the flashlight drain energy when it is on
 
 lightSource.enabled = true;
 lightSourceDim.enabled = true;
 
 while (turnedOn && lightEnergy > 0) {
 lightEnergy -= drainSpeed*Time.deltaTime;
 yield;
 }
 lightSource.enabled = false;
 lightSourceDim.enabled = false;
 
 }
 
 function OnGUI () {
 
 GUI.color = Color.green;
 GUI.Button(Rect(10, 10, (Flashlight.lightEnergy), 40), "Battery");
 
 }

And this is my battery pickup script:

 var batteryPower : int = 20;
 
 function OnTriggerEnter () {
 
 Flashlight.lightEnergy = Flashlight.lightEnergy ++ batteryPower;
 
 }

I attach it to my battery and set the battery as a trigger, yet it tells me there is a compiler error. Halp!

Thanks :D

EDIT: I also need help to add an audio clip (a torch button click) when 'F' is pressed. If anyone can help with that, thanks.