Low Power - No Warning

I have a 15.4 " MacBook Pro. I've had it for several months now. For the first few, whenever the battery charge dropped to about 4 or 5 minutes, a warning would pop up on the screen. It told me the computer was about to resort to reserve power and I should plug it in.
Recently, the warning has stopped appearing. When the power bar says I have between 12 and 30 minutes of power remaining, the screen simply goes black. The computer doesn't power off, it just goes to sleep, but it won't wake up unless I plug it in and tap a key.
Why is this? What do I need to do to return to getting a warning at 5 minutes instead of my computer randomly shutting down?

Resetting the SMC, as suggested, along with a Battery Calibration…
http://docs.info.apple.com/article.html?artnum=86284
… will often fix this issue.

Similar Messages

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    I can’t begin to tell you how many documents and changes have been lost in the past few weeks since this began....
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    Depends on how long you've being using the battery without complete discharge and then recharge, the battery meter may become inaccurate, and that's probably why your Mac didn't realize the low power and didn't give you warning.
    You can re-calibrate the battery meter by a complete discharge immediately follow by a complete charge. Make sure you charge it right after the discharge, otherwise it may went to a protected mode that need to be revived. Note that you should only do this occasionally, keep it charged in usual usage.
    If this doesn't seem to work, maybe you should call Applecare.

  • Low power warning for AIR-LAP1242AG-C-K9

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  • USB low power message

    G4 (MDD) running OS X 10.4.11 - Just got a Zoom H2 digital recorder - when I try to connect to USB (via powered hub) I get a low-power warning and no luck connecting (even with the H2 plugged in via A/C). It works fine when I plug directly into the USB port in the back of the computer. There are only 2 USB ports on my G4 - my hub is in one USB port (has my printer and a couple of flash drives in it), and the other onboard port is for my keyboard. This does not seem to be a USB version issue, but rather an available-power issue (?) Can anyone please suggest a solution - do I need to add a USB card (PCI), and if so, what can you recommend for my system? Thanks in advance!!

    Your Mac's USB ports are USB 1.1. Even if you didn't get the low power message, the video transfer would be very slow.
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  • USB Low power?

    I have a few USB devices - some USB 1.1, some 2.0.
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  • Satellite T130 - Turns off because of low power

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    hi c3po thanks for your reply. Yes i am using the supplied adaptor, i've only had the laptop a few days. no i haven't checked for a bios update, i'll do that. I had the laptop on for nearly 4 hours before it turned off, and it was showing 3 hours or so remaining, it's quite strange, maybe i should ring toshiba?

  • Ibook - low level battery warning

    hello:
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  • HT1212 I had left my iPad for a day with low power.  I have since plugged it in to recharge and it will not turn on.  It is competly dead.  How do I restart?

    I had left my iPad with low power for a day.  When I pluged it in it will not recharge or turn on after being plugged in for 24 hours.  It is completely Dead.  How can I recharge?

    Try resetting the iPad:
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  • Low power mode

    I went hiking this past weekend and wanted to only take my iphone instead of the usual GPS, camera, and cell phone. Unfortunately, my battery will only last about 24 hours (or less if at extreme edge of cell range).
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    Tell Apple:
    http://www.apple.com/feedback/iphone.html

  • Mac Pro Low Power 1.5V FBDIMM's

    Is there a way to get the Mac Pro to be able to use Low Power 1.5V FBDIMM's instead of the standard 1.8V FBDIMM's?

    Wrong post

  • Disable low power wake?

    Hi everybody,
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    Steffen

    Here the solution:
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  • In search of msi 945gt speedster-a4r (MS-9632) or low power consumption

    When and where can I find the msi 945gt speedster-a4r or MS-9632?
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    So far, the 975x boards like Aopen have dual pci-e x16 slots but they appear only to work only with graphics boards.   
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    I'm afriad that nobody can gives you a definate answer on your question as this concern many factors to say as in production lines, marketing and distribution.

  • Cisco 3702i running on a WLC 8500 Drawing low power from 2960s

    Hi .. 
    I keep getting alarm errors in Prime 2.1.
    "Access point 'AP01' associated with controller 'WLC-01'
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    I have all ready done the following & still getting the same results :
    1)Used the port command "power inline port maximum 30000
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    3)Enabled CDP on the AP and PoE+ Switch 
    4)check & unchecked "Pre-Standard State" and "Power Injector State"
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    Regards
    Chris

    Could be similar to the below bug, Please the TAC notes at the bottom
    AP process CDP packet addressed to bogus multicast address
    CSCtc39367
    Description
    Symptom:
    All AP1252s in a given VLAN, which are on switchports configured for extended
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    cases an RMA was done for the faulty Access Points.
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    deployment please open a TAC Service Request.

  • When I plug in a Lexar thumb drive, I get a "USB Low Power Notice' saying it cannot operate because it needs more power than is available.  This is new.  Thumb drives worked last week.  Any suggestions?  Is this an apple or a Lexar issue?

    When I plug in a Lexar thumb drive, I get a "USB Low Power Notice' saying it cannot operate because it needs more power than is available.  This is new.  Thumb drives worked last week.  Any suggestions?  Is this an apple or a Lexar issue?

    Apple intentional, use a powered USB hub instead.

  • Win10 defeating my system's low power modes

    Both of these devices ran properly in their low-power modes under 8.1x64:
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    Mike...Thanks for the reply!  This is a real head-scratcher...;)  I've used the last three drivers from AMD for the gpu--same result every time.  All clocks in the system bios (UEFI) are set to default, and my Win10 install is UEFI (not legacy)
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