Issues With MacBook Pro Shutting Off

I have been having troubles the past couple of days with my MacBook Pro shutting off when running on battery power.
MacBook Pro OSX 10.4.11. 2.16 Intel Core Duo. 1 G Ram.
I will have plenty of battery charge and then "poof", computer just goes black and has no power. It does turn back on, but gets annoying. Everything runs fine when plugged into the wall.
Anyone have any ideas of what may be causing this?
Thanks.

How old is your machine? This sort of thing is covered under warranty (or apple car). I got a new one about a year ago that way. Apple WILL ask for number of charge cycles. Believe it or not, high numbers can be good because it says that you have actually been using the battery and it's not just dead from sitting unused.
It sounds like you have a dead cell. Your battery is separated into several compartments. Your charge looks fine until that cell is actually needed. At that point, CLUNK. Nothing works.

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Launch the built-in Terminal application in any of the following ways:
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Issues With MacBook Pro Shutting Off

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