When I'm going to be working remotely for an entire day – like writing at a coffee shop, or liveblogging a conference keynote – my first major concern is always, "Is there Wi-Fi?" After that it's, "Will my battery last?"
My main computer is currently a 13-inch MacBook Pro from early 2011, and the battery isn't great. Whenever I walk into my workspace for the day, I usually head straight for the seat closest to a power outlet. If I can't find power, the sweating begins somewhere around hour three.
But with the 2013 edition of the 13-inch MacBook Air, concern over battery life is now just laughable. I've been testing Apple's newest ultraportable laptop for a couple of weeks, and I can routinely get through a full 8 to 12-hour workday without a boost, and with battery to spare. Heck, I went an entire Netflix-filled weekend without needing to plug it in once. Where the mid-2012 model got a very respectable 7 hours of battery life, the 2013 model is spec'd at a full 12 hours. It delivers on that promise, and then some. I can forget the charger at home or at work and totally not stress about it.
While the Air's lithium-ion battery itself has grown slightly (7.6 V and 7150 mAh compared to the 2012's 7.3 V, 6700 mAh battery according to iFixit), the boost in power savings is really thanks to the Air's new super-efficient, 1.3 GHz Core i5 Haswell processor. Compared to the Ivy Bridge-wielding 2012 Air, CPU speeds are just mildly better, but Apple promises a 40 percent bump in graphics processing. While the Air is understandably not as lightning-fast as Apple's beefier MacBook Pros, I had no complaints about the Air's overall performance in everyday applications like web browsing, video streaming, and word processing.

