Simple flashlight script

Flashlight.cs

using UnityEngine;
using System.Collections;

// @kurtdekker
// place this on the flashlight, which must have a Light component

public class Flashlight : MonoBehaviour
{
	public float battery = 20;
	bool isOn;

	void Update()
	{
		if (Input.GetKeyDown("f"))
		{
			isOn = !isOn;
		}

		if (isOn)
		{
			battery = battery - Time.deltaTime;
		}

		if (battery <= 0)
		{
			isOn = false;
		}

		GetComponent<Light>().enabled = isOn;
	}
}