2008 Macbook pro having battery issues.

Battery Information:
Model Information:
Serial Number:          SMP-bq20z951-395d-33dd
Manufacturer:          SMP
Device name:          bq20z951
Pack Lot Code:          0000
PCB Lot Code:          0000
Firmware Version:          002a
Hardware Revision:          000a
Cell Revision:          0100
Charge Information:
Charge remaining (mAh):          3639
Fully charged:          Yes
Charging:          No
Full charge capacity (mAh):          3668
Health Information:
Cycle count:          765
Condition:          Good
Battery Installed:          Yes
Amperage (mA):          0
Voltage (mV):          12485
Showing a charged battery, but when I pull the power cord off of it, it shuts down. Then I have to reseat the battery to get the power cord to work again. Can't turn on the computer without the powercord. I've done the SMC reset a few times now. My battery is showing the below information which from what I read , it's still in good shape
System Power Settings:
AC Power:
System Sleep Timer (Minutes):          10
Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          10
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
Battery Power:
System Sleep Timer (Minutes):          10
Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          10
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:          No

I would suggest taking the computer to an Apple Store or Authorized Apple Service Provider to have your computer checked. I can say that based on your numbers your battery is about to reach the end of its usable life (which is about 1000 cycles), however that should still allow some time of computer use after taking the MagSafe adapter out of the computer. Ask the rep to run a complete hardware test on your computer. You can also save some time by running the Apple Hardware Test yourself and noting down any error codes that may appear during the course of the test and giving them to the repair representative.
You can learn more about the Apple Hardware Test here:
http://support.apple.com/kb/HT1509
Hope this helps!

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District_58 wrote:
Hi. I have a same problem with my new MBP 13 RETINA (late2013)
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How bad is bad? How long is your battery lasting?
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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. For instructions, launch the System Preferences application, select Help from the menu bar, and enter “Set up guest users” (without the quotes) in the search box. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
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Test while in safe mode. Same problem?
After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of steps 1 and 2.

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http://support.apple.com/kb/HT1490
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I am an happy user of a late 2008 MacBook pro.
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Hi!
Thanks for all the answer. Please let me to resume this old and interesting discussion.
After having evaluated several solutions (including NAS, different ways of backup, etc) I bought an external firewire HDD, since I believe it nicely fits my necessities. Next, after these holidays, I will finally replace my old HDD with a SSD one. I think 120 GB are ok. I just need the apps and small-sized documents (rather LaTeX, Matlab, word, pages or excel documents, etc. - no movies or mp3 (I have Spotify, for that) ). Large files (e.g. movies, pictures, etc) may end up in external firewire HDD.
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Only problem is that maybe the battery you were sold was manufactured around the same time as the Mac. And LiPo batteries die because of old age as well as use. Take it out and carefully examine all markings, especially anything that can date when it was made, like copyrights or such.
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4SNS/1/40000000 LB1T
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Two pieces of information that may or may not b helpful, the hard drive is from my early 2008 MBP and the only test disc I have access to is from an iMac.

Why do you have LION installed on that older machine?
So you say you built a macbook from a bucket of parts eh? Kudos
heres a pic of the battery temp sensor

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How many hours does a brand new battery last after fully charged. I have a late 2008 Macbook Pro.

clintonfrombirmingham is right, there is no way to exactly tell. But from personal experience, a new battery on a 2008 will last for about 2 1/2 hours with a higher screen brightness and doing something taxing to the battery (like gaming or running lots of 3D programs). But if you're just listening to music with the brightness all the way down, and no programs running, you could get up to 12 hours. So for average use, it should last you a whole business day (assuming you don't use it more than 30% 0f the time). Hope this kind of gives you more of an idea of what to expect:)

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I have updated to 10.9.2
Message was edited by: wplewis

Bring it back to the Apple store with your MBP and charger. If the battery is found to be defective, they should provide you with a replacement (assuming you are in the warranty period).
Ciao.

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Do you have access to an Apple Store? The best thing to do would be to make an appointment at the genius bar to have it stress tested and evaluated. It could be defective, or it could be worn out. If you have Applecare, there's a chance they may give you a free replacement, but the only way to find out for sure is to ask them.
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Apple released a firmware update for your MBP model to enable it to charge properly with the new-style adapters, after failures to do so were widely reported. Here's an article about the problem:
http://support.apple.com/kb/TS3499
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http://support.apple.com/kb/DL1311
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2008 Macbook pro having battery issues.

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