Try click here . However do make sure that you select an Operating System, or you will be expected to supply your own. I am unsure about the battery life.
Try looking at the Intel Centrino set ups. They aim to give 4.5hrs of battery life, but come at the cost of processor speed (1GHz to 1.6GHz) They also tend to be expensive. Try click here ,who have a Centrino model, but is £999 exclusive of VAT.
Hope this helps!