White Macbook Battery Goes down so fast

Hi Everyone I've had this problem about 2 weeks ago until i calibrated the battery after trying all the things such as holding the power button for 10 seconds and holding those 4 buttons Commabd, Option, R and P while the laptop was off ...so it happened again with the full battery charged i get 1:47 hours of battery in "Better Battery Life" mode ...
Model Information:
Serial Number: SMP-ASMB016-38ac-1506
Manufacturer: SMP
Device name: ASMB016
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0200
Cell Revision: 0102
Charge Information:
Charge remaining (mAh): 1705
Fully charged: No
Charging: No
Full charge capacity (mAh): 1847
Health Information:
Cycle count: 167
Condition: Check battery
Battery Installed: Yes
Amperage (mA): -1116
Voltage (mV): 12391
its about 8 months old, when the first time it happened, i took it to an Apple store and when the "genius guy" tested it he showed me a chart on my laptop that it was in the green section and he told me its allright and i need to change it by myself

What do you guys recomend ? will buying a new battery help to solve the issue ?

Dear spinnerlys
i actually used the coconut, what it shows is that my macbook is 11 months old, even though i have the purchase recipt which is about 8 months ago !!! WEIRD
and about the health current battery capacity is 2006, therefore the full capacity should be 5020 and about the cycle, its 168 ..
and it shows 39 % on the bottom bar

I hope so , i actually took it to an apple store, the genious guy was being a jerk and telling me its like 168 cycle and it has passed half of the full cycle which is 300, so its ok that you just have 1:45 of charge ....
so u think they are supposed to replace it for free right away ?