A new Macbook Air only has 2 hours battery??

I bought my 13" macbook air for less than two weeks. When I plug in the charger and have the battery charged to 100%, I found that there're only 2:xx remaining time. How can I fix the problem? Or do i need to have my battery charged for longer period of time (I'm didn't charge my battery for a long time when I first bought it, but only to 100% then unplug). 3 hours of working without charger is really short for me and I'm afraid that I cannot take it when I'm out. Isn't Apple said that the battery can persist for 10 hours? Why I cannot have this?
Thanks!

Runaway applications can shorten battery runtime

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