Computer suddenly shuts down! No "low battery" message HELP!

Ok, about two weeks ago I plugged by computer into a desk lamp at a hotel. Appearately there was a voltage issue and I heard a pop then my computer blacked out! I had to restart and when I did all my "stuff" was gone! I was able to recover my documents, etc but it was a little scary! Ever since then I have to keep my power cord plugged in. I can unplug it but it will calculate my battery life as 1 hour then will completely shut down in the next 10-20 minutes. And when I plug it back in I have to completely restart. What do I do now?

I just pasted all the info here just in case...
AC Power:
System Sleep Timer (Minutes): 25
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 25
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: No
Battery Power:
System Sleep Timer (Minutes): 30
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 15
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: No
Reduce Brightness: No
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 1572
Remaining Capacity (mAh): 1572
Amperage (mA): 91
Voltage (mV): 12565
Cycle Count: 511
AC Charger Information:
Connected: Yes
Charging: No
Hardware Configuration:
UPS Installed: No

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Message was edited by: Carolyn Samit

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Hey Citrinesky,
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Computer Shuts down when on battery power at 80%

The battery power indicates anywhere from 80% to 90% and will shut down the computer.
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Computer suddenly shuts down! No "low battery" message HELP!

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