Major Slowdown on Low (7%) Battery

Discussion in 'MacBook Pro' started by Terenc3, Jun 2, 2012.

  1. Terenc3 macrumors member

    Joined:
    Jul 15, 2010
    #1
    Hi. Just for the last three to five charges of my battery, I realised that the entire system will hit a major slowdown (super super laggy) for a minute and then turn itself off. These happens between battery charges of 5% to 7%.

    Whenever I plug in the cable and bootup, system shows 5% to 7% battery charge left. By right, the major slowdown and turning off only happens when it is near 1% or at 0% from what I knew, previously. :confused:

    I am not entirely sure, but I was suspect 10.7.4 to be the cause (I might be wrong), or maybe it is my battery (500 cycles @ 90%). Battery condition registers at 'Normal'.

    Anybody faces the same issue? I might do a reinstall on system or change my battery to try rectify this problem.. :(

    Thanks in Advance. :D
     
  2. yusukeaoki macrumors 68030

    yusukeaoki

    Joined:
    Mar 22, 2011
    Location:
    Tokyo, Japan
    #2
    Why would you use your laptop and not charge it until the last couple percentage?
    Having many cycles on battery and running on battery makes CPU underclock its self to save battery health.
     
  3. ixodes macrumors 601

    ixodes

    Joined:
    Jan 11, 2012
    Location:
    Pacific Coast, USA
    #3
    I make a habit of recharging at around 15%. Therefore I have no experience with a discharge state that low. Research reveals that running your computer when it's that low, is actually hard on the battery & not advised.

    Apple has some excellent battery info for each of their products at:
    apple.com/support.
     
  4. jbzcar macrumors regular

    Joined:
    May 11, 2012
    #4
    Sounds like its writing the hibernation file to disk in anticipation of losing power.
     
  5. yusukeaoki macrumors 68030

    yusukeaoki

    Joined:
    Mar 22, 2011
    Location:
    Tokyo, Japan
    #5
    Yeah that was my guess as well.
    Probably getting the datas ready to be safe even if it runs out of battery.
     
  6. Terenc3 thread starter macrumors member

    Joined:
    Jul 15, 2010
    #6
    Thanks guys for the replies. :D

    But yea, writing files in preparation for hibernation sounds logical but it normally happens in 1/2% state previously. However, it actually happened at 5% - 7% now that makes me wonder why.. :confused:

    About using the mac till battery hits <10%, I really dun have a choice as I'm normally out for 7 hours or so. I guess its time for me to get another power brick or maybe a new mac :cool:..
     
  7. ayeying macrumors 601

    ayeying

    Joined:
    Dec 5, 2007
    Location:
    Yay Area, CA
    #7
    I run it down to about 5% usually especially under Windows and I never seen that before.
     
  8. GuitarG20 macrumors 65816

    GuitarG20

    Joined:
    Jun 3, 2011
    #8
    do you have a source for this statement? I don't believe it...
     
  9. jbzcar macrumors regular

    Joined:
    May 11, 2012
    #9
    Windows behaves differently than OSX in that respect.
     
  10. ayeying macrumors 601

    ayeying

    Joined:
    Dec 5, 2007
    Location:
    Yay Area, CA
    #10
    I said especially, not only. I've ran it down under OSX before and it doesn't have that either.

    Infact, the CPU slowdown is a firmware thing, not the OS, so regardless if you're under OSX or Windows or Linux, it shouldn't matter.
     

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