Is battery life supposed to go not even a year?
There is detailed information available about your battery.
Click on Apple (top left)

About This Mac
More Info
System Report
Power

In the Health information it shows how many cycles you had so far.
I have 142 cycles since Oct. 2012.
The battery should last about 1000 cycles.
If you have a problem please see Apple service.

Above you see some comparison data (from my MBA)
Running @ 100% brightness, Mail, Firefox, Chrome, WIFI and more, consuming about 1200 mA.
Unfortunately Apple does not show the remaining life as time, so you have to use a formula to calculate that, but it varies based on usage (mA).