Mac shuts down when 90% POWER and its PLUGGED IN!

I recently took over my husbands mac pro OS 10.4.11. At first, all was going well. Then I noticed one day, it shut down on me and I was like, that's weird, I had no warning. I did see other postings about this so it must be common or an issue with the battery. The thing is, its plugged in 100% of the time when I use it...if I do not have it plugged in, well, it shuts down after about 5mins...if that. I am not sure what is going on. Does anyone know (if it is the battery), roughly what a fix like this would cost? I read on other posts that you need the battery info, etc....this is what my mac says: Anyone have any idea just looking at this?? I greatly appreciate it!!!!!
AC Power:
System Sleep Timer (Minutes): 25
Disk Sleep Timer (Minutes): 180
Display Sleep Timer (Minutes): 25
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: No
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 5
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 1
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 3225
Remaining Capacity (mAh): 3009
Amperage (mA): 973
Voltage (mV): 12562
Cycle Count: 203
AC Charger Information:
Connected: Yes
Charging: Yes
Hardware Configuration:
UPS Installed: No

Actually, it just shuts right off, even being plugged in. For instance, it has been plugged in all day and my battery icon (at the top right) shows 98%...but the power cord (normally green light shows, is orange)...it just shut off on me about 5mins ago again. No warning, no programs saying they will close, just went black. No hibernation, etc...I had to push the "on" button to get it back on...It's so frustrating. Almost like it has had enough and goes off or like it's dying....So even though the battery shows fully charged, it still just shuts off....and I can be in the middle of typing or web surfing, etc...it doesn't happen when I just have it on but not using it (like a power saving thing)..it shuts off even when it is actually being used. I have no clue what to do.
Thanks so much for trying to help me out. I really appreciate it!

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> {quote:title=Xardas wrote:}{quote}
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