out of curiosity just did a video test on my n900

height : 320
width : 608
data rate : 855kbps
total bitrate :983kpbs
frame rate : 23 frames/sec

audio : 128 kpbs
channels : 2 stereo
audio sample rate : 48khz

file size : 700mb
length : 1hr 39min

The above file I played in a loop(manually of course , no feature in n900 to play in loop ) for about 5hours continuous with wifi connected and on 3G network till i got the first low battery warning.

Had foreca weather widget running.
Emails via nokia messaging.
and sound through headphones.

hope that helps somebody benchmark their toy, if its better , it should bring you a big smile

IMHO i think the battery is just about OK, nothing exciting, but nothing to feel too bad about for the kind of device it is.