acer tablet pc windows 7
acer tablet pc windows 7

What is the best laptop / notebook with improved battery life that has good performance?
I have a gateway nv53 my mother for me, its battery lasts about 2 hours or less. I am looking for a laptop or notebook hybrid netbook / to replace him. I have at least 4 hours of battery life, but some want 5 +. I want to run Windows 7 Premium and have at least one screen of 11.6 inches. So far, I think Acer Aspire One 721 and the duo ispiron dell. However, the duo is more than a netbook and does not think it would be a Tablet PC and has no HDMI port. I wonder if you could recommend a computer that is around 500 and has a good performace, and other things mentioned above.
I would say something like Asus G73, or the HP Envy 15. Both have large capacity batteries and the very good performance.