Got a new 13" Macbook Air. I've only been browsing the web, and the battery's at 80%, stating there's only three hours left, which is a big decrease from the advertised seven hours of battery life. How accurate is the estimated time the website purports and the battery indicator states? Should I make sure my battery isn't broken?
I find the standby time is more like 15-18 days and the battery life is more like 5-5.5 hours, using regular usage. I have a 2011 MBA 13".
I know it seems weird for people to mention Flash, but Flash is a huge culprit. It really hits the CPU hard and spins up the fans, both of which are huge contributors to battery drain. By Flash, I don't mean videos, other videos are less onerous.
For me the 13 inch Air doesn't really make sense. I'm getting an Air as an ultraportable laptop and the 13 inch is still a decently large footprint that you might as well get a Mac Book Pro. Thickness and weight aren't as big an issue for me once you get up to that size, and the closer you get to 15 inches you might as well get the Next Gen Pro.
I prefer ultra-light laptops and I was a little disappointed when work got me a 13" instead of an 11", but just to ease your mind--the low weight, slim thickness, tapered design, and great carryability help mitigate a lot of the instinctual concerns you might have about a 13" versus an 11". I previously had a 15" MBP (wayyyyy too huge, wayyyyy too heavy), a 13" Macbook (too heavy, too big), a 12" iBook (a little thick and heavy but close to where I wanted it), and a 7" eeePC (perfect weight, keyboard a little cramped). I also have an iPad and a Kindle.