Laptop refuses to run on battery power alone

I have a 17'' 2006 model Macbook Pro that I bought off eBay in August of 2008 that has worked fine up until today; as of a few hours ago, it does not run solely on battery power, and will automatically shut down when the power cord is removed. The battery shows a full charge and had a 3:00 charge when i used it sans power cord a few days ago. The previous owner claims to have replaced the battery shortly before selling me the computer.
Is this a battery issue or something else?
I'm pretty sure the model number of my computer is MA611LL/A.

When was the last time you calibrated your computer? Calibrating your computer's battery for best performance
To check for a bad battery, go to Apple/About This Mac/More Info
In the System Profiler window, select the Power entry & look for Health Information.
If next to Condition it says "Check Battery" then your battery is probably on the fritz.
MacBook and MacBook Pro Battery Update 1.2 MBP must have been purchased between February 2006 and April 2007.
To check which model Macbook Pro you have, go to Apple/About this Mac. Note the info next to "Processor"

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