Today I finally had to change the battery in my Sony SRF-59 radio. A single AA battery has lasted me since January of 2008! Talk about long battery life. Supposedly the battery is supposed to last 100 hours, but I think the Life Brand akaline I had in it outlasted that number considerably.
You can find out more about this fun little machine at DXer.ca or at the Yahoo Ultralight DX group.