Laptop cutting off when not plugged in

When not attached to the charger, my macbook pro (3 yrs old) will abruptly turn off. I can use it for 5-15 minutes and then the screen just goes black. At that time I can plug it in and turn it back on without a problem. I assume the battery is going bad. Any body know what's happening?

Sounds like the battery needs replacing, as you suspected.  Open System Information and find the battery info under Power.  Here's what mine looks like:
  Charge Information:
  Charge Remaining (mAh):          11711
  Fully Charged:          Yes
  Charging:          No
  Full Charge Capacity (mAh):          12034
  Health Information:
  Cycle Count:          87
  Condition:          Normal
  Battery Installed:          Yes
  Amperage (mA):          0
  Voltage (mV):          8285
What does yours say?

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