MBP Battery Problem?

[saxondale.]

Hi

I have a C2D MBP 15", updated to the latest battery firmware etc and when im running the laptop off its battery, i get about 2.30mins out of it. This is when the display brightness is all the way down apart from one, airport off, bluetooth off, anything else such as iScrobbler is turned off. Surely this isn't right, even then, it doesnt feel like im getting 2.30mins worth. This is when im doing a word document.

Not sure if this helps, this is when its connected, fully charged:

 

[Rule]

Did you try calibrating the battery?

Charge it until the light turns green then run it on battery until it goes to sleep. Then leave it for 5 hours sleeping, unplugged. Then charge it back to 100%

 

[saxondale.]

That was the first thing i did when i got it, im guessing i should do it since i updated the battery?