I have a dell laptop and my battery life is only 1.5 hrs. And I have one of the 2 hour batteries. I'm kicking myself in the ass too because I didn't buy a second battery at the time of purchase. I haven’t been shopping for a notebook recently buy I assume that they can came with a combination of battery types.
To answer your second question, I carry my laptop around, when I'm gone at work and I'm staying in hotels and when I need to get some work done. Most of them nowadays are getting Wi-Fi installed so I can have access when I'm bored off my ass in the hotel room. I'm not in college staying at the dorms, so my answer might not be exactly what you're looking for but it's another opinion to add to the mix.
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