ibook vs. powerbook

[Robert Gunter]

I know everyone is tired of the perpetual ibook/powerbook debate, but i 
have a question that I've had a difficult time finding the answer to in 
forum archives.

Situation:  Looking to buy a new 12 inch 1 Ghz ibook ($1200) OR a 
refurb 12 inch 1 Ghz powerbook ($1199).

Question:  Internally, I know that these two models are essentially the 
same.  The new ibook uses the 7447a G4 processor and the older refurb 
powerbook uses the ever-so-slightly older 7447 G4.  The only variable 
I'm concerned with is battery life.  So...anyone out there with the two 
above models...could you please post your battery life?  (Although any 
other observations would be appreciated.)  I expect most of you will 
have ibook only figures to post though :) that's ok.

Thanks!
-Rob