One of the most sure-fire ways to get a flame going is a battery and steel wool. It's fast and easy. Works under almost any conditions.  It's great for emergencies, because it doesn't take a lot of dexterity. So, if you're injured, or in frigid conditions, you can trust this method to get you warm. Before you start, make sure you are storing the battery and steel wool apart. It is so affective, there's a good chance a fire could start in your bug-out bag if these items aren't stored properly.

You'll need:

1. 0000 Extra Fine Steel Wool

2. 9 Volt Battery

The first thing to do is collect tinder, kindling and wood. Arrange them in whatever method is best under current conditions. 

Second, lay the wool out. It's best if the wool has been fluffed a bit so there are a lot of different contact points. 

Now, just drag the 9 volt battery across.  It should light on fire in moments.  But remember, DO NOT TOUCH THE WOOL while the battery is touching. You'll get a little shock. But otherwise, it's a safe and effective firestarting technique. It could save your life.