All flashlight scripts don't turn off my spotlight

 using UnityEngine;
 using System.Collections;
 
 [RequireComponent(typeof(Light), typeof(AudioSource))]
 public class Flashlight : MonoBehaviour {
     public AudioClip clickSound;
     public float batteryLifeInSec = 300f;
     public float batteryPercentage = 100;
     
     private bool on;
     private float timer;
     
     void Update() {
         Light lite = GetComponent<Light>();
         timer += Time.deltaTime;
         
         if(Input.GetKeyDown(KeyCode.F) && timer >= 0.3f && batteryPercentage > 0) {
             on = !on;
             audio.PlayOneShot(clickSound);
             timer = 0;
         }
         
         if(on) {
             lite.enabled = true;
             batteryPercentage -= Time.deltaTime * (100 / batteryLifeInSec);
         }
         else {
             lite.enabled = false;
         }
         
         batteryPercentage = Mathf.Clamp(batteryPercentage, 0, 100);
         
         if(batteryPercentage == 0) {
             lite.intensity = Mathf.Lerp(lite.intensity, 0, Time.deltaTime * 2);
         }
         
         if(batteryPercentage > 0 && batteryPercentage < 25) {
             lite.intensity = Mathf.Lerp(lite.intensity, 0.5f, Time.deltaTime);
         }
         
         if(batteryPercentage > 25 && batteryPercentage < 75) {
             lite.intensity = Mathf.Lerp(lite.intensity, 0.8f, Time.deltaTime);
         }
         
         if(batteryPercentage > 75 && batteryPercentage <= 100) {
             lite.intensity = Mathf.Lerp(lite.intensity, 1, Time.deltaTime);
         }
     }
 }

I can click F to turn the light on and off and it works. However the battery runs out and it remains on. No errors or anything. I'm using Unity 4.5.1 if anyone is wondering.