Hello everyone, I am currently involved in a project where I'm building a pipboy 3000 from scratch. I'm close to finishing it and I wanted to take the extra step and make some functional/interactive buttons on it. I've been searching for led button switches to use for some of the buttons for the pipboy and this one was the best option I found all day (its the only one I found that ships here in the US and its the best fit; 8mm diameter button). I was hoping if anyone might be available to help me figure out how many (and what kind of) batteries would I need in order to make a circuit with the led button functional? I know the basics of electrics since I took automotive in high school and how to solder/build basic circuits, but I'm not too good in creating a circuit from scratch. Here's the ebay link to it; http://www.ebay.com/itm/IDEC-AL8M-A...924218?hash=item5d5b8cf9fa:g:qwsAAOSw~gRVuXhs The only useful information I think I found about this led switch is that its max capacity is 24 volts but I'm not sure if that's the led bulb circuit or the slave/power circuit. Here's another answer I received from another site, but I'm not sure if the info is accurate, "3vdc or greater, 20 mA current. You supply the external resistor based on maintaining 20mA. Vf varies between 1.7v and 2.2v depending on color, and If is the standard 0.02 amps. See page 3 of source. Two AA batteries in series would power it for a long time. If it was illuminated only 5 or 10 minutes a day, a single CR2032 coin battery would work R = (Operating Voltage – Vf) / If Source(s): https://www.idec.com/language/english/catalog/Switches/A8Series.pdf"