tungsten filiment lighter
Believe it or not, you do not need a power source at all to light a filament hot enough to light a cigarette. Many years ago I had a lighter that,with no power source would light a cigarette! It looked like two lipstick tubes. One standard lipstick size. One sampler lipstick size,side by side. The large one contained felt around its inside diameter. The smaller one held a very thin tungsten wire filament. The large one was first filled with enough denatured alcohol to keep it moist. You heated the tungsten filament over a stove burner flame. This is the incredible part. The filament was then placed into the small tube. It stayed hot for so long, that when you pulled it out of it's tube, and inserted it into the large tube of denatured alcohol, It was warm enough to ignite the alcohol instantly. The filament only had to be heated once. When it ignited, it reheated the filament enough to work the next time, even if it was weeks between lights. I often wish that I still had that lighter today. So, that's something to ponder during your attempt to build your lighter. Good luck.