Shutting down at 20% power

Macbook Pro circa 2009, 2.26 Intel Core 2 Duo, OS 10.8.2.
Some weird things have been happening lately, but most obvious is this. At between 15-20% power, my machine shuts down. Or rather, goes into a power conservation hibernation. I plug in a power supply and after pressing the power button it wakes up. It's as if 20% actually means 0%.
Another anomoly has been the machine not waking from sleep. The keyboard lights are on, but the display does not wake, requiring a force restart. But I guess I'm more concerned about the first one at the moment.
This is unsettling, no idea how to troubleshoot. Thank you for any assistance.

Have you done the battery update? About Battery Update 1.2.
I had this happen to me but at 23%. Apple replaced my battery with no problem. If your MacBook is the original core duo which it sounds as it is then you are in luck. The battery for the original has had it's warranty extended an extra year. Even if you MacBook warranty is dead the batteries isn't. If the update doesn't work contact Apple at the number listed in the update.
One point is be firm but polite. I had no problems getting mine but others have had to argue some to get the battery replaced.

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First, I apologize to everyone for asking this question yet again. I have gone through the previous posts and I am still at a loss. So thank you for your patience and help.
When I run my MacBook pro on battery power it will run for around 15 - 20 minutes... then just be dead. No low battery warning. No shut down. Just poof and gone.
I have looked at my power settings to see if my battery is bad. But I don't have a Status indicator in there. I see This:
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 0
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Wake On Clamshell Open: Yes
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Remaining Capacity (mAh): 1185
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AC Charger Information:
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I have also looked at the directions on http://support.apple.com/kb/ht1490 about how to calibrate my battery. It says:
" 1. Plug in the power adapter and fully charge your PowerBook's battery until the light ring or LED on the power adapter plug changes to green and the onscreen meter in the menu bar indicates that the battery is fully charged.
2. Allow the battery to rest in the fully charged state for at least two hours. You may use your computer during this time as long as the adapter is plugged in.
3. Disconnect the power adapter while the computer still on and start running the computer off battery power. You may use your computer during this time. When your battery gets low, the low battery warning dialog appears on the screen.
4. At this point, save your work. Continue to use your computer; when the battery gets very low, the computer will automatically go to sleep.
5. Turn off the computer or allow it to sleep for five hours or more.
6. Connect the power adapter and leave it connected until the battery is fully charged again."
Only I have a problem withe step 3 and 4. I don't get the warning, and it doesn't go to sleep. So, I don't think any calibration is working.
Do I need a new battery? Should I just buy one? This computer is WAY out of warranty and I never purchased and apple care plan for it.
Again, than you for any and all advice on what I may need to do.

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Is there a way to automatically shut down laptop when power button pressed?

Of all the things I am having to struggle through a learning curve on MacOS (converted from Windows), this might seem like a rather benign concern, but I'm going to ask anyway. . .
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I'm trying to set up my MacOS to have the power button automatically go through the shutdown process as IF I had actually clicked on a confirmation box to shut down the computer.
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AC Power:
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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
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Voltage (mV): 12562
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AC Charger Information:
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Hi KW305,
welcome to macbook forum.
Try reset your SMC / PRAM:
http://docs.info.apple.com/article.html?artnum=303319
http://docs.info.apple.com/article.html?artnum=2238
Install battery updater:
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http://docs.info.apple.com/article.html?artnum=86284
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jigzmom wrote:
My iPhone 5 has recently started shutting down when it reaches 30% power on the indicator. If I power it back up it will show just less than 30% and work for a few minutes longer, but then shut down again. Another power up will then show a depleted battery. I've had this phone nearly two years and it's just begun to do this. I found a thread from 2013 that had a variety of "fixes" but none that seemed to work. I'm running OS7.0 and do not wish to upgrade, as I've had friends who upgraded and lost everything. Other than replacing the phone at full price (not really an option), any suggestions?
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yes it is the 5.1
Battery Information:
Model Information:
Serial Number:          DP-bq20z951-3981-3c62
Manufacturer:          DP
Device name:          bq20z951
Pack Lot Code:          0000
PCB Lot Code:          0000
Firmware Version:          002a
Hardware Revision:          0005
Cell Revision:          0100
Charge Information:
Charge remaining (mAh):          1761
Fully charged:          No
Charging:          Yes
Full charge capacity (mAh):          2110
Health Information:
Cycle count:          135
Condition:          Check Battery
Battery Installed:          Yes
Amperage (mA):          -578
Voltage (mV):          12033

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HP 630, i3 processor, OS WIN7
Hello. I hope someone can hel me with this problem.
After pressing the power button the screen comes on and I can see the black screen with the HP logo in the middle and in the lower left corner ist says "Press the ESC key for startup menu". The boot does not go past this screen ans the notebook shuts down after 30 seconds.
What I have tried so far:
Removed HDD and RAM and reinserted them again and tried to boot.
Results: The same, shutdown after 30 sec.
Removed battery and power plug and pressed the power button for 30 sec. Then I connected the power (only) and tried to boot again.
Results: The same.
Tried to boot without HDD.
Results: Error message "Boot device not found..." and shutdown after 30 sec.
Booted into bios and set the defaults. I have to be quick because I have only 30 sec for making changes before it shut down again.
Results: The same.
Tried to boot from live flash disk drive with linux mint.
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Hello @Mainzer ,
Thanks for posting on the HP Forums!
I understand you are experiencing an issue with your notebook. However, since this is a commercial notebook, you should post your issue on the notebook board of the HP Enterprise Forums for a better answer.
Have a wonderful day!
Mario
I worked on behalf of HP.

Shutting down at 20% power

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