THG reviewed both the Fujitsu's Lifebook B6110D and Toshiba's Portege R200 notebooks:

Just because a laptop is thin and light doesn't mean that it has to lack power. We took a look at products from Fujitsu and Toshiba, both of which have harnessed improved battery technology and low power components to make laptops that weigh less than 3.5 lbs and can run as long as five or four hours respectively on standard batteries..



Link: Tom's Hardware Guide