How to Make a spark and fire with a 9 volt battery and steel wool
If you're out in the wilderness at night and it's starting to get chilly, you sure as hell better know how to make yourself a campfire. But let's just say you forgot your matches and don't feel like rubbing two sticks of wood together hoping to create a spark.
If you have a 9 volt battery with you and some steel wool you can just as easily create a spark and start a fire. Technically you need at least a D battery, but a 9 volt works best.