MacBook battery faulty?

[AragakiLove95]

Hello I have a MacBook Air 2013 11' which I've brought a few months ago. 2013 MBAs are known to have long battery life, just like mine, around 7-9 hours of usage.
Lately my MacBook battery life really took a change, at fully charged once I started using just surfing web, it shows 3hours+ usage remaining. I have turned off every single thing which could be draining the battery and even dim the brightness. This morning I just checked, not opening any applications and at 92% shows 3 hour 30 minutes remaining battery life only.
Do you think there's something wrong with it and I should bring it to the service centre or something and get it checked?
Thanks guys!

 

[Geforce3]

U sure u got the haswell mbas?

 

[szeli]

hold option key n click e batt icon. what does it say?

 

[AragakiLove95]

U sure u got the haswell mbas?

Yup very sure about that! 1.3Ghz core i5

 

[AragakiLove95]

hold option key n click e batt icon. what does it say?

it says condition: normal
but at 87% usage left is only 3:00 remaining without touching anything

 

[PetPet]

Are you running Flash? (Youtube, Neopet's Flash Games etc)
Disable it.

 

[AragakiLove95]

After upgrading to mavericks, my battery life is back to normal about 13-16 hours

 

[B772ER]

maybe some runaway process in OS X affecting your battery life..