My system is the latest PR1.2.

And usually, I use a 802.11n support router to get access to the internet
(actually, N900 is useing 802.11b because it does not support 802.11n)

After about 3 hour web browsing, by Wifi
the battery drained.

Ususally, after about 6 to 7 hours use, I had to change battery.

I thought this is normal at first.

Because it is said that N900 is a 'power eater'




But lately, I find that the power use of my Wifi is set to 100mW

and another choice is 10mW !

After switch to 10mW, my N900 can use for 2 days ! (48 hours)

Hope that can help you.

And also, hope that Nokia/Maemo can set the power of the Wifi to 10mW as default value.