Check the health of your battery by downloading iStats. http://bjango.com/mac/istatmenus/
It also makes a huge difference if you constantly have your fingers on the touchpad for scrolling and stuff. Also with switching apps and any kind of actual use it is usually close to 4-5h. 7h or more is only in close to best case scenarios. A script that forwards every 20 seconds doesn't result in the same workload as a person clicking on a link, reading and scrolling down and 20 seconds later click on the next link. If you only open a pdf and close skype you can probably get depending on brightness something of around 7-10h. you should use keys to scroll and switch pages.
I have the i5 2011 13in MBP -- I generally get close to, if not a little more than 7 hours with what I consider normal usage. IM, Chrome with a few tabs, maybe a little MS word, maybe some Flash play back. But, I dislike backlit keyboards and bright screens, so that saves me a lot of battery drain.
Also, I've been able to watch two movies back to back, and have some battery life left.
One thing I love about my 2010 MBP 13, is that when I have the screen at about 30-40% and Im running some websites and microsoft word, I'll get anywhere from 8-11 hours. It's amazing.
I have the i5 2011 13in MBP -- I generally get close to, if not a little more than 7 hours with what I consider normal usage. IM, Chrome with a few tabs, maybe a little MS word, maybe some Flash play back. But, I dislike backlit keyboards and bright screens, so that saves me a lot of battery drain.
Also, I've been able to watch two movies back to back, and have some battery life left.
yes, this is true. I've seen a max of 10 hours but I'll routinely hit 6-8 in normal usage. Now, when I'm working in iMovie with HD content that can drop to 3 hours or so. The "i" series of processors from Intel will scale down to very low power or scale up to high performance depending on what you need at anytime. So, you'll see a larger spread of battery life depending on how you use the system.
Exactly right.If you want to watch youtube videos divide time by 2, you want to download? divide time by 3, play games? Divide time by 4.
Exactly right.
I can usually get 5-6 hours when I'm coding in Xcode and running the occasional unit test or simulator. I'm pretty happy with it. (On a 2011 15" MBP)
I think, alongside the "wireless web" time, they should run the HL2 FPS test on repeat and provide that time as well. Sure it will be dismal, but at least it would give us another metric to compare machines against.