rMBP Battery Health Decline

Discussion in 'MacBook Pro' started by charlieegan3, Jul 2, 2012.

  1. charlieegan3 macrumors 68020

    charlieegan3

    Joined:
    Feb 16, 2012
    Location:
    U.K
    #1
    I have now had my new MBP for a week and the battery health last week was 97, now its 94 (8103mAh), and seems to keep going down! What am i doing wrong?:confused:

    I am only using the machine on battery. I charge it all the way up and then use it all the way down, normally in one go.

    I haven't calibrated the battery yet, will this make a difference? is the way that i am using the battery damaging?
     
  2. miles01110 macrumors Core

    miles01110

    Joined:
    Jul 24, 2006
    Location:
    The Ivory Tower (I'm not coming down)
    #2
    If you think it's a problem then take it in for inspection by a Genius. Otherwise wait until you actually have a problem.
     
  3. Puevlo macrumors 6502a

    Joined:
    Oct 21, 2011
    #3
    Battery health will fluctuate wildly. This is perfectly normal.
     
  4. charlieegan3 thread starter macrumors 68020

    charlieegan3

    Joined:
    Feb 16, 2012
    Location:
    U.K
    #4
    Would you say this is normal? I really don't want to be damaging my battery, i'm trying to make it last.

    ----------

    Would calibrating the battery help?
     
  5. prfrma macrumors regular

    Joined:
    May 29, 2010
    #5
    Yeah, you shouldn't be doing that.

    Charge often, probably running down battery to 70-50% ideally before charging again to ensure long life, although I wouldn't worry about it right now. Best waiting a few months when there is actually available stock.
     
  6. charlieegan3 thread starter macrumors 68020

    charlieegan3

    Joined:
    Feb 16, 2012
    Location:
    U.K
    #6
    Stock? what a replacement?

    How should I be using my computer then to best look after the battery? turn off while charging i guess?
     
  7. d3bruts1d macrumors member

    Joined:
    Jul 29, 2009
    Location:
    TN
    #7
  8. charlieegan3 thread starter macrumors 68020

    charlieegan3

    Joined:
    Feb 16, 2012
    Location:
    U.K
    #8
    Maybe it is best to wait a little bit to see more of a difference but I just don't like the idea that everyday i'm slowly killing my battery.
     
  9. JohnDoe98 macrumors 68020

    Joined:
    May 1, 2009
    #9
    When mine arrived the max capacity was ~8760. After 20 cycles, yesterday it was down to ~8230, about a 5% decline. When I woke up this morning, the max capacity was 8552. So there does seem to be quite a bit of fluctuation going on from day to day. I'm always running it from 100% down to about 3-4% before charging it back up.

    I'm going to wait until it dips below 7800 mAh, before I get worried.
     
  10. scarred macrumors 6502a

    Joined:
    Jul 24, 2011
    #10
    Why are you continuously discharging it? Can't you run with it plugged in sometimes? It is 2012, not the 90s. Battery tech is much different, batteries don't have 'memory' anymore.

    I'd recommend calibrating it once (someone posted instructions above), and then use it 'normally'. Plug it in when you are sitting at a desk or table, battery when not. Then forget about it for a while. Check in a few months and if things look bad, bring it in.
     
  11. boy-better-know macrumors 65816

    boy-better-know

    Joined:
    Jun 30, 2010
    Location:
    England
    #11
    Thats not the best way to cycle your battery. I wouldn't be doing that.
     
  12. mzjin macrumors 6502

    mzjin

    Joined:
    Oct 28, 2011
    #12
    I can't believe people are using full discharge cycles on their MBP. Unless you have a good reason to not carry your adapter around or simply have no outlet access for 7 hour long periods...
     
  13. JohnDoe98 macrumors 68020

    Joined:
    May 1, 2009
    #13
    I bought a portable with 7 hours battery, not a desktop. Why should I have to plug it in unless it needs to be charged? Do you plug in your iPhone or iPad every couple of hours?

    ----------

    What's wrong with full discharge cycles? I can't believe people like the clutter of being plugged in.

    ----------

    What's wrong with such usage? Is it bad for iPhones and iPads? What's your source?
     
  14. charlieegan3 thread starter macrumors 68020

    charlieegan3

    Joined:
    Feb 16, 2012
    Location:
    U.K
    #14
    I'm totally flexible, I can use it plugged in, or on battery, when ever I want. All I need to know is what the best way to use it is. There seems to be conflicting opinions here.
     
  15. JohnDoe98 macrumors 68020

    Joined:
    May 1, 2009
    #15
    I'd side with Apple's opinion. They say no calibration whatsoever is needed for us, and they don't say we need to plug in. They say their new technology is supposed to guarantee that we shouldn't lose more than 20% over the first 1000 cycles. So, as I said earlier, keep running it as you think is best for you, and if it keeps dropping keep an eye out. I'd say if you lose over 10% in the first 100 cycles, you have something to complain about.
     
  16. markp99 macrumors member

    Joined:
    Jun 14, 2012
    Location:
    New Hampshire
    #16
    I am curious as well the issue with a ~full discharge.

    I understand that battery memory is less/no longer a concern, but what "harm" does a full discharge pose to these batteries?
     
  17. charlieegan3 thread starter macrumors 68020

    charlieegan3

    Joined:
    Feb 16, 2012
    Location:
    U.K
    #17
    I guess thats all I can do, I'm just terrified of getting hit by the £195 pounds replacement battery.
     
  18. prfrma macrumors regular

    Joined:
    May 29, 2010
    #18
    If by the next 10-11 months your battery is misbehaving (ie, only holds an hour of charge), you should be able to claim manufacturing default on the battery - most likely.
     
  19. JohnDoe98 macrumors 68020

    Joined:
    May 1, 2009
    #19
    If you actually have a battery drain problem, rest assured with the way you are using your laptop currently you will be below 80% in less than a year and the replacement will be free.
     
  20. charlieegan3 thread starter macrumors 68020

    charlieegan3

    Joined:
    Feb 16, 2012
    Location:
    U.K
    #20
    Lets hope so.:)
     
  21. Feed Me macrumors 6502a

    Feed Me

    Joined:
    Jan 7, 2012
    Location:
    Location Location
    #21
    Apparently fully discharging lithium based batteries can harm them.
    Also there's no need to fully cycle them every time, as you would a NiCd battery.

    The rule of thumb I use is:
    - Plug in whenever
    - Unplug whenever
    :D

    Don't give yourself extra work worrying about battery cycles and discharging. Just try not to stress the battery out by completely sucking all the life out of it. Ideally you want your battery to hover around 50% most of the time, but of course that never happens.

    TL;DR: Don't worry about it, plug in when you can, don't fully discharge the battery, don't worry about it.
     
  22. charlieegan3 thread starter macrumors 68020

    charlieegan3

    Joined:
    Feb 16, 2012
    Location:
    U.K
    #22
    does apple not have a recommended use for their notebook batteries?
     
  23. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #23
    It is perfectly normal if your battery health (maximum capacity) is more or less than 100%, even when brand new, or if it fluctuates up or down over time. For further details, read the CHECKING STATUS AND HEALTH section of the following link.
    The built-in batteries in the newer Mac unibody notebooks come pre-calibrated and do not require regular calibration like the removable batteries.

    Run on battery whenever you need to and plug it in whenever you can. You can plug or unplug at any time, regardless of the charged percentage. Just make sure you don't run on AC power all the time, as your battery needs to be used regularly to stay healthy. This should answer most, if not all, of your battery questions:
     
  24. scarred macrumors 6502a

    Joined:
    Jul 24, 2011
    #24
    It shouldn't harm anything, but you don't need to do it. Use the battery when you can't plug in (travelling, on the sofa, on the bed, car, whatever). Plug in when you are stationary (at a desk or table). That is what Apple expects you to be doing. If you are always stationary, be sure to discharge once a month.
     
  25. JohnDoe98 macrumors 68020

    Joined:
    May 1, 2009
    #25
    By full discharge potentially harming the lithium battery they do mean a full discharge. If you still have 1-2%, that's not a full discharge and so far as I know there is no evidence that going that low is harmful. If you have some actual hard data to show us, please do.

    Why? Is this just your opinion, or do you have anything to show us?
     

Share This Page