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Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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Mac shuts down when running on battery alone

My mac shouts down when is not plugged in. Specially when I watch videos on youtube or on a VLC. Now it's doing it more often, even when I'm emptying the trash.

Battery health is at 84%, and once its off stays the same way, so it's not the battery. It doesn't over heat (according to iStat)

I've opened it to dust off and still doesn't solve it, so it's not dust either.

Any help? Thanks


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Выбранное решение

Permissions, PRAM, or re-installing the OS will not do anything for the battery.

When you use Disk Utility to repair disk permissions, it reads the Bill of Materials files from the initial Mac OS X installation and compares its list to the actual permissions on each file listed. Therefore, you should repair disk permissions, if you experience symptoms that indicate permission related problems after installing software, software updates, or applications not hardware issues like a battery.

PRAM stores certain system and device settings in a location that Mac OS X can access quickly. Exactly which settings are stored in the computer's PRAM varies depending on the type of computer as well as the types of devices and drives connected to the computer. Some information store in PRAM includes: display and video settings, startup volume, speaker volume, recent kernel panic information, & DVD region setting.

I would check your Console, it can be found here: /Applications/Utilities/Console.app

Select All Messages and search for shutdown. You should see a message "Previous Shutdown Cause: "

If you see any of these causes take your computer to the Genius Bar, they can get you a new battery. If you don't see any of them still take it to the Genius Bar because they can look at the shutdown causes and find out why it is shutting down, and also run battery diagnostics on the battery.

Shutdown Cause: 0 = Battery/Power disconnected: Normal behavior if battery was removed while system was on and no other power source connected.

Shutdown Cause -60 = Battery fully drained: Normal behavior if unit was left asleep on battery for too long.

Shutdown Cause -103 = Battery cell under voltage detected.

Shutdown Cause -74 = Battery temperature exceeds 65C for 3 milliseconds

Shutdown Cause 2 = Battery is fully discharged

Good Luck!

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Nice research. + Ralph


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if you haven't sorted it by now..

i've been having the same probs with my new mac, thought it may have been compatibility issue, but isn't

took forever to find answer online. i did this after spending a half hour on the phone w the mac help desk..to no avail. this despite the answer being posted on the apple thread below for some time..

no i've finished whingeing..

here's the link and the answer.

should sort it, good luck



22-Jan-2013 10:50

While watching movies using VLC on my MacBook Pro every 20 minutes I get the message "Are you sure you want to quit all appilcations and log out now ?"

I press cancel and it goes away for another 20 minutes. Very annoying.

Tried uninstalling and reinstalling VLC. Also changed the power time outs.

MacBook Pro, Mac OS X (10.7.5)

This solved my question by Linc Davis on Jan 22, 2013 8:31 PM

Linc Davis

From the menu bar, select

 ▹ System Preferences... ▹ Security & Privacy ▹ General

If there's a closed padlock icon in the lower left corner of the preference pane, you may need to click it to unlock the settings. Enter your login password when prompted.

Click Advanced, then uncheck the box marked Log out after 20 minutes of inactivity in the sheet that opens. Click OK, then quit System Preferences.

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I recommend you to download coconut software to check your battery status and then discard it is a problem with the battery.

The next step could be check the permissions, reset the PRM and in the worse case scenario reInstall Mac OS X

Download Coconut battery software from here:


Try this and if the problem persists you shoul take your computer to an Apple Store to be check by an technician because can be a factory problem.

Good luck

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