I always liked battery life of Nokia internet tablets (the 770 and the
N800) - they were able to survive more than a week of light use (if no
WiFi was used!) an ages when off.
I expected the same from the N900 phone (it has a new battery). But it
is not like the tablets. I charged it last week and then left it OFF.
And the battery is flat today.
So I turned the N800 on and have started to use it. I even do not
remember when I charged it. Was it this year? The battery is still
almost full.