Macbook pro turns off when taken off the power-cord, is the battery bad?

For a while my MCP when I take it off the charger it doesnt hold the whole time as it should and the battery doesnt last long, and now the past couple days when i take my laptop off the power-cord it will stay on for five minutes then shut down. I dont know what is going on, maybe a bad battery? I got my computer august 2006 . These are my numbers.
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 590
Remaining Capacity (mAh): 431
Amperage (mA): 685
Voltage (mV): 12575
Cycle Count: 167
isnt the fully charge capacity a little low? what should I do?
thanks!

If your MacBook Pro is a core duo model you may have a bad battery and be elgible for a battery replacement. The batteries on the original core duo MacBook and MacBook Pro had the warranty extended and extra year. The details are in this link.
MacBook and MacBook Pro Battery Update 1.2
Call Apple at the number in the link and explain your problem. You could also go into an Apple store and get help there.

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Hi,
Download and run the stand-alone battery test utility available on the page below and see if this reports any problems with your battery.
http://h20239.www2.hp.com/techcenter/battery/battery_ts.htm
Regards,
DP-K
****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
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Microsoft MVP - Windows Experience

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http://support.apple.com/kb/HT3964
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Battery Information:
Model Information:
Serial Number: Sony-ASMB012-3887-4d
Manufacturer: Sony
Device name: ASMB012
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0303
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Fully charged: No
Charging: Yes
Full charge capacity (mAh): 2074
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Cycle count: 57
Condition: Check Battery
Battery Installed: Yes
Amperage (mA): 121
Voltage (mV): 12275
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 20
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
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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
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
Charging: Yes
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HT1359 it says you must connect the power cord so the battery will never work on its own?

"after Battery Update has been installed, each battery you insert into your MacBook or MacBook Pro will be updated automatically. Your computer's power cord must be connected and plugged into a working power source."
you can never again use the laptop unless the cord is plugged?

daurisn wrote:
you can never again use the laptop unless the cord is plugged?
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Macbook pro turns off when taken off the power-cord, is the battery bad?

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