On Thu, 30 Dec 2004 01:21:02 GMT, LenS wrote:
I've seen TV commercials for a portable, battery driven soldering tool
whose tip supposedly produces enough heat to solder small joints
almost instantly, and then, almost as quickly, cools enough to touch.

They've been around since the 70's. The are a soldering gun powered by
nicads and take advantage of the monsterous current that nicads can put
when a near short circuit is put across the battery.