My old CC Pandora's main battery was over a year old - and was worn down to the 6+/- hour capacity. My new 1Ghz Pandora was on Sunday for nearly 12 hours continuous with sporadic wifi use - and was down to 45% remaining. My old CC unit used to seem to do that too when it was new.
Having a fresh battery makes a big enough difference that I don't see how any of us can make a direct apples to apples comparison short of buying another new battery to throw in the old CC unit and spend 15 hours doing the same thing on two machines at once.