There is no need to speculate, Anandtech has already tested the battery performance of of Ivy Bridge i7s: http://www.anandtech.com/show/5872/intel-dual-core-iv

There is no need to speculate, Anandtech has already tested the battery performance of of Ivy Bridge i7s: http://www.anandtech.com/show/5872/intel-dual-core-ivy-bridge-launch-and-ultrabook-review/6 http://www.anandtech.com/show/5872/intel-dual-core-ivy-bridg... It seems safe to assume they put a 36 watt hour battery in there (iPad3 is 42.5) since the transformer book is bigger in all dimensions and as you point out has hardware that needs a big battery. If the graphics are switchable (also reasonable) that should yeild 4+ hours for video and nearly 6 hours for web browsing with Flash. I don't see why it shouldn't have decent battery as a tablet and possibly great battery life when docked as a laptop. There are also i3 and i5 models available. Apple isn't doing this because they are supply bound on a product that has 40% margins.