You can produce a fire by using a battery, from a vehicle, aircraft, atv, even your camera batery (see video below). Using two insulated wires, connect one end of a wire to the positive post of the battery and the end of the other wire to the negative post. Touch the two remaining ends to the ends of a piece of non-insulated wire. This will cause a short in the electrical circuit and the non-insulated wire will begin to glow and get hot. Material coming into contact with this hot wire will ignite.
As with any fire starting method, use caution when attempting to start fire with a battery. Make sure that sparks or flames are not produced near the battery because explosive hydrogen gas is produced and can result in serious injury!