Bigger phone means bigger screen so it's not as easy as that. The screen and GSM are the biggest power draw in a phone.

Also those who think a newer and faster CPU does not have any advantages are overlooking the advantages that newer phones have because of this extra power; for example screen resolution, Flash, etc, etc.

I love the N900 and the N9 but as tech savvy people lets not kid ourselves, faster newer processors are a good thing. I also didn't really see much of a battery advantage when I compared an N9 to a Galaxy Nexus so I'm not sure where this is coming from.