You're not making much sense. Anyway, the battery life of my iPod classic 80 gig is a bit better than the Zune 120. The fact that the backlight can be adjusted on iPod using a graduated slider sure helps, and the smaller (than zune) iPod screen also saves power. I used to have a iPod 5th gen 30gig and it also had a decent battery life.
As far as battery life goes, iPod is a bit better than the Zune, but mainly it's because of iPod's smaller screen. Zune only has 3 step settings for backlight brightness. Low, Medium and High. Not much difference between Medium and high.
Still, the Zune has so many qualities about it that are better than the iPod, that a slight decrease in battery life is a small price to pay. I voted for Zune because I like just about everything about it better than the iPod. So the battery life isn't quite as good as the iPod, but the trade-off is more than worth it.
Your opinion of the zune is NULL. You admitted you never had one. So that opinion doesn't count. Sorry.