From: utzoo!decvax!harpo!npoiv!alice!rabbit!ark Newsgroups: net.aviation Title: Sigtronics intercom Article-I.D.: rabbit.607 Posted: Fri Jul 16 10:49:27 1982 Received: Sat Jul 17 01:57:13 1982 If you want to equip a Sigtronics intercom with a self-contained battery, the easiest way is to buy a female cigarette-lighter plug at an automotive parts store and wire it up to a battery. You will want something like two 6V lantern batteries in series. No battery that fits inside the Sigtronics case is likely to be useful, because the intercom's current drain will exhaust the batteries in short order.