Walt Mossberg Tests Two New Laptop Batteries - Walt Mossberg - Personal Technology - AllThingsD

The new MacBook Air is ~27% less expensive than the comparable Sony, when the latter includes an optional second battery (the Sony is ~14% more expensive if you're willing to have ~half the battery life)

"In my tests, I was able to largely confirm Intel’s battery-life claims. This was especially true of the 13-inch MacBook Air I evaluated, whose battery life in my test jumped 65 percent from my last test of the machine, even though it hasn’t been significantly redesigned, except for the inclusion of the new Intel chips, faster Wi-Fi and solid-state storage and a slightly more potent battery. It has become a computer capable of all-day use when performing typical tasks, even though its dimensions and 3-pound weight are unchanged."

Walt Mossberg Tests Two New Laptop Batteries - Walt Mossberg - Personal Technology - AllThingsD