Just to clarify something that appears to be a common misconception - Apple doesn't ever replace the iPad battery, it just gives you a whole new iPad for $105.95:

http://www.apple.com/support/ipad/service/battery/

As a point of comparison, my Lenovo batteries that always seem to crap about a few years in cost about $100:

http://www.newegg.com/Store/BrandSubCategory.aspx?Brand=1041...

So... that's a pretty great deal. And I think speaks to how comfortable they are with the battery longevity. Or how fat their margins are.