MBP shutting down despite near-full battery charge?

This is making my crazy, crazy.
My battery appears to charge just fine and my adapter works as it should.
However, if I wake up my laptop and work without the adapter, I'll only get a little under five minutes worth of time before it shuts down suddenly. No warning whatsoever.
The machine recognizes that there is no adapter plugged in and the battery appears to drain at a normal rate. From 100% to about 95% before it shuts down.
Can someone please help me figure out what's wrong here? (This is a replacement battery sent by Apple after I sent my recalled one in last year.)

Some of the replacement batteries have also been defective. There are two battery replacement programs, one for specifically recalled serial numbers (you) and one for all Core Duo batteries with certain symptoms. Your battery is exhibiting the symptom "+Battery exhibits low charge capacity/runtime when using a fully charged battery with a battery cycle count (as shown in System Profiler) of less than 300+," as described on this page, which also states that the battery warranty has been extended to 2 years for all Core Duo machines.
Be sure to check in Utilities > System Profiler > click Power that your cycle count is <300. If so, contact Apple (or go into an Apple Store) for a replacement. If your cycle count is >300, your battery is just getting old (you still need a new one, but you'll have to pay for it).
Hope this helps...

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