Updated question: As using nichrome wire does not seem to work in my application, I am looking for ideas how to ignite this smoke cartige, electrically and with no explosives and with a battery shorter than AA. Thanks! Hi, First, I have very little experience in electronics. I am familiar with Ohm's law but don't undestand it fully in every situation. However, I'm developing a product in which I need to make a nichrome wire glow for at least 5 seconds, with help of a battery. The lenght of the wire must be at least 5 cm and must be at least 0.2 mm diamater. (Longer/bigger is even better). I am trying to find the smallest battery possible, due to very limited space. After 5 seconds, it doesn't matter if the battery goes flat, as long as it doesn't explode, catch fire or anything else unpleasant. I have already read through every forum with similar questions like mine, and have understood that I need a battery that can deliver enough current. I therefore have an idea that I maybe could use a high capacity coin cell battery of model CR2477 (1000 mAh, 3 V). However, as I, due to my limited knowledge in electronics, I cannot predict what will happen to this battery and I'm too scared to try. I also found this website that let's you calculate, for example current requirement with a given wire: http://www.jacobs-online.biz/nichrome/NichromeCalc.html If I punch in the following data: 5 cm length, 32 gage, 2 volts, I get a current requirement of 1.15 Amps. I entered 2 volts because of internal resistance of the battery, don't know if that was correct. Will the CR2477 battery be able to supply 1.15 Amps for 5 seconds? Will anything not nice happen to it? In the data sheet of the battery I read a maximum pulse current of 25mA, which makes me think that it will not work. But at the same time, I know that a standard 9V battery would work, and this has less capacity in mAh (though higher current). Can somebody help me understand? Thanks!