I've been battling a bad battery for weeks on the N810. And i had tried all the tricks in the trade, like disabling the wimax module entirely, turing down wifi power consumption, turning off bluetooth, turning on power saving mode on wifi etc...
All this while I hadn't checked out what the maemo wiki said on this topic
, and the first thing they say is to disable RD mode. I had done that a long time ago to look at the bootup messages and forgot to turn it off since then. I've disabled it now, and the tablet's been running in a semi idle state for three hours with just .01 percent drained. Wow!
BTW, this text was written in maemo-wordpy
. Check it out in case you haven't heard about it, it's cool stuff.