Mac Forums

I recently purchased the more expensive 13 inch so I would have more gigs and RAM. The man at the store told me the battery lasted 7 hours but it seems to die much faster than that. I did the whole thing when I got it where i charged it then let it die then charged it all the way again. It just seems to be draining really fast. What is wrong? It's really bothering me. How long does yours last?

(P.S., im very new to macs. I grew up with PCs.)