Flashlight Battery Help

Hello!

I am creating a flashlight with batterys and I got some problems. When the flashlight is off nothing happends and when I activate it again, it goes down only like 0.05 on the battery life. Also when I reach 0 it goes to -.

Here is my code: Flashlight (C#)

 using UnityEngine;
 using System.Collections;
 
 public class Flashlight : MonoBehaviour {
     
     private bool FlashlightOn = true;
     public AudioClip clickOn;
     public AudioClip clickOff;
     
     public static float BatteryLife = 1;
     public float BatteryReductionSpeed = 3.0f;
     private float BatteryReductionSpeedOff = 0.0f;
     
     public float onIntensity = 3.0f;
 
     // Use this for initialization
     void Start () {
         light.intensity = onIntensity;
     }
     
     // Update is called once per frame
     void Update () {
         if(Input.GetButtonDown("Toggle Flashlight") && FlashlightOn == false){
             FlashlightOn = true;
             light.intensity = onIntensity;
             audio.PlayOneShot (clickOn);
             BatteryLife = BatteryLife - (BatteryReductionSpeed * Time.deltaTime);
             
             if(BatteryLife <= 0 && FlashlightHud.BatteryCount > 0)
             {
                 FlashlightHud.BatteryCount --;
                 BatteryLife = 100;
             }
         }
         else if(Input.GetButtonDown ("Toggle Flashlight") && FlashlightOn == true) {
             FlashlightOn = false;
             light.intensity = 0;
             audio.PlayOneShot (clickOff);
             BatteryLife = BatteryLife - (BatteryReductionSpeedOff * Time.deltaTime);
         }
     }
 }

FlashLightHud: (C#)

 using UnityEngine;
 using System.Collections;
 
 public class FlashlightHud : MonoBehaviour
 {
     public static int BatteryCount;
     
     void OnGUI()
     {
         GUI.Label(new Rect(10,10,80,30), "Flashlight:" );
         GUI.Label(new Rect(70,10,80,30), Flashlight.BatteryLife.ToString("F2"));
         
         GUI.Label(new Rect(10, 30, 80, 30), "Batteries:");
         GUI.Label(new Rect(70, 30, 80, 30), BatteryCount.ToString());
     }
 }

Thanks!