The new iPad has a 42.5 watt hour battery. The iPad 2 was only 25 watt hour. That's a 70% higher capacity battery in the new iPad! I was shocked to see this. The retina display must be pulling a lot of juice, as many suspected (particularly those who said a retina display would not happen). The article that points this out is here: http://www.zdnet.com/blog/hardware/new-ipads-most-revolutionary-feature-is-its-battery/18985 Apple lists the battery sizes in the tech specs on their website, so this is confirmed. iPad weight differences are 1.44 lbs vs 1.33 lbs, an 8% difference. So let me get this straight: They took the biggest, heaviest component in the iPad and increased its capacity by 70% but only bumped the weight of the device by 8%? How'd they do that? As ZDNet implies, there must be more advanced technology in that battery. I also wonder about charging. The charger in both the iPad 2 and new iPad is 10W per Apple's website. So does the new battery take a charge faster, or will it take 70% longer to charge the device?