Willcom and Sanyo have come up with this weird looking battery phone.
It runs on a single AA battery, giving you 250 hours of standby time or 5 hours of talktime. You won’t find many features though, not even a screen.
Some more pictures and information at Uber-Review.
(Update: Links in this article were removed because the pages no longer exist and this product could not be found at any other stores.)