It always useful to have a back up (or two) and the know-how to start a fire when you forget your matches or they get wet in a rain storm. This battery method looks so simple. I knew that fine “0000” steel wool burns easily with a match even if is is wet. But this is one more ultralight tool for that all important fire for cooking for keeping warm. Be sure to keep a fresh battery in your pack.
Be light. Be safe. Be one with the pack.