Previous 1 2 3 Next 29 Replies Latest reply: Apr 11, 2014 1:15 AM by PlotinusVeritas Go to original post
  • Bimmer 7 Series Level 6 (10,275 points)

    In your previous post, you mentioned that you've gotten over 6 hours of battery usage from your MB.


    You do know that once your MB hits a certain percent when charging, it stops the fast charge system and switch to trickle charge.


    There are even times that your Macbook is plugged in and will say fully charged but at 95%.  That is normal.


    Since your MB is sitll under warranty, why don't you just use it and worry about the battery 1 month or 2 before your warranty expires then replace it if needed.


    Your one of the lucky ones getting over 6 hours with your battery.  So don't worry too much about it.


    If it bothers you too much, you can drive down to the Apple store and have them look at it if you wish.

  • mondesigns Level 1 (0 points)

    Actually i am no longer under warrenty that why its bothering me and i am from Nepal so there is no Apple care here only authorized apple dealers who are very hard to deal with (i had to change harddisk underwarrenty not too long ago). I am very thankful you took your time to reply. I just wanted to know if its battery problem and not other hardware problems. And you are right that i am lucky to be getting over 6hours since i have Lion now after the harddisk replacement. Thanks.

  • Bimmer 7 Series Level 6 (10,275 points)

    I myself wouldn't look at it as a battery problem or any other hardware problem if my Macbook is working for what I need it for.


    I would however, start worrrying if I get constant lockup/freezes when I'm using my MB which is not your case.  Your battery is lasting you more than 6 hours which is more than what other people are getting.  So just keep using your MB and enjoy it.


    Once the battery is no longer effective, it will give you a message to service your battery.  Right now however, just relax and enjoy your MB.

  • mondesigns Level 1 (0 points)

    Update: My battery capacity took another dive from 83 percent to 78 percent overnight.

  • eww Level 9 (52,980 points)

    I agree with Bimmer that if you're still getting six hours of battery life, you're doing very well regardless of what's being reported for your battery's capacity. If there is any problem, I suspect it's a misreporting problem and not a failing battery. You can have the machine tested for either or both, but maybe not in Nepal. The difficulty or impossibility of doing so is one of the hazards of using a Mac in any place where Apple has no corporate presence. If the inconvenience of having the machine tested is simply too great to bother with and the machine is working well apart from the apparently erroneous capacity readout, you might as well just keep using it.



    How many charge cycles does the battery have on it?

  • mondesigns Level 1 (0 points)

    I have 58 cycles in 14 months. Is there any chance its my power adaptor's fault? i cleaned it recently.

  • eww Level 9 (52,980 points)

    No, I don't think the power adapter can cause an actual decline in battery capacity OR a faulty readout of the battery's capacity. Whatever the problem is — if there is one — it's inside the computer's case.

  • Nishdesai95 Level 1 (0 points)

    Im having a similar problem heres the screenshot of the battery fluctuations. If anybody could help please.

    Screen Shot 2014-04-07 at 11.41.31 pm.png

  • mondesigns Level 1 (0 points)

    Hey. Don't worry about it. I was laptop noob when i first posted this but as i have seen battery capacity does fluctuate. I am on same macbook pro and i use it daily for my work and have same battery with 87 percent capacity. So just use it as normal and just dont let it draw power too fast on battery like playing 3d games. Have a good day.

  • Nishdesai95 Level 1 (0 points)

    First of all thanks for replying. Can you  please tell me how many cycles have you used up?And what is the battery capacity currently?

  • mondesigns Level 1 (0 points)

    Battery capacity is at 87 percent and cylce is 251. Thats not too many for 3 years plus machine but i am connected most of the time. Hope it helps.

  • Nishdesai95 Level 1 (0 points)

    Wow! Mine dropped to 93.8% with the 83rd cycle in the 8th month! Your battery capacity increased since the original post says you had 83% initially. Thats good. So you have your laptop plugged in most of the time?

  • mondesigns Level 1 (0 points)

    Ya thats why i was worried at the time. Though my battery had gone bad but next few charges the capacity increased. Ya i am mostly connected but i use it sometimes for 'battery exercise' which is important i heard. One thing i can say for sure is don't discharge it completely. Thats how my sister ruined her dell battery in less than a year.

  • PlotinusVeritas Level 6 (14,725 points)

    Thats good. So you have your laptop plugged in most of the time?




    Ya thats why i was worried at the time.







    Thats what ruined your battery.


    "Apple does not recommend leaving your portable plugged in all the time."





    Proper understanding of a battery charge cycle


    A charge cycle means using all of the battery’s power, whether that is at once, or over several shorter battery discharges and recharges.


    Two examples for clarification:

    As a first example, where one fully charged battery is discharged down to 10%, then fully recharged, then using 10% of that full charge, this counts as 1 cycle since the total of both discharges is 100% of a full charge of use.


    In the second example, where one fully charged battery is discharged down to 40%, then fully recharged, then using 40% of that full charge, this also counts as 1 cycle since the total of both discharges is 100% of a full charge of use.


    While both examples are that of a single charge cycle, the first example is more aggressive against the lithium battery chemistry than is the second example. In short, collective overall gentle shallow or mid-range draining of your lithium battery is a better use condition than is the first example of deep-draining of the battery.  While both are quantitatively identical as a single charging cycle, they are wholly different qualitatively on the battery chemistry, which is directly related to its ultimate longevity and health.


    In short, it is the near and mid-term life of the battery as relates to its proper care (or lack thereof) that is to be looked after.


    Priorities in order of decreasing importance for battery care are:

    1. Avoiding deep discharges of the battery.

    2. Avoiding having your battery constantly on charge or on charge and in sleep mode.

    3. When playing graphics intense games, use your notebook plugged in when possible.

    4. Reduction of battery cycles by plugging into power when on the go, or when accessible.


    A person who has, for example, 300 charge cycles on their battery and is recharging at say 40% remaining of a 100% charge has a better battery condition state than, say, another person who has 300 charge cycles on their battery and is recharging at say 10-15% remaining on a 100% charge. DoD (depth of discharge) is vitally important on the wear and tear on your Macbook’s battery, much more so than is the counting of charge cycles. There is no set “mile” or wear from a charge cycle in specific. Frequent high depth of discharge rates (draining the battery very low) on a Lithium battery will greatly hasten the lowering of maximum battery capacity.


    Understand that a charge cycle is a general parameter of use, but is not directly related to the short-term or mid-term abuse of the battery, which can rapidly hasten a shorter lifespan, regardless of what the actual cycle count on the battery indicates.


    Proper considerations for near-term care of the battery is of utmost importance. Abuse of the battery is entirely avoidable, long-term eventual old age deterioration of the battery is entirely unavoidable.



    General consideration of your MacBook battery

    Contrary to popular myths about notebook batteries, there is protection circuitry in your Macbook and therefore you cannot ‘overcharge’ your notebook when plugged in and already fully charged.

    However if you do not plan on using your notebook for several hours, turn it off (plugged in or otherwise), since you do not want your Macbook ‘both always plugged in and in sleep mode’.

    A lot of battery experts call the use of Lithium-Ion cells the "80% Rule", meaning use 80% of the full charge or so, then recharge them for longer overall life. The main quantified damage done in the use of Lithium Ion batteries are instances where the internal notebook battery is “often drained very low”, this is bad general use of your notebook battery.

    All batteries in any device are a consumable meant to be replaced eventually after much time, even under perfect use conditions.


    If the massive amount of data that exists on lithium batteries were to be condensed into a simplex, helpful, and memorable bit of information it would be:


    1. While realistically a bit impractical during normal everyday use, a lithium battery's longevity and its chemistry's health is most happy swinging back and forth between 20% and 85% charge roughly.


    2. Do not purposefully drain your battery very low (10% and less), and do not keep them charged often or always high (100%).


    3. Lithium batteries do not like the following:

    A: Deep discharges, as meaning roughly 10% or less. Avoid this in all instances if you can. This is hard on your battery.

    B: Rapid discharges as referring to energy intensive gaming on battery on a frequent basis (in which case while gaming, if possible, do same on power rather than battery).

    C: Constant inflation, as meaning always or most often on charge, and certainly not both in sleep mode and on charge always or often.


    From Apple on batteries:

    "Apple does not recommend leaving your portable plugged in all the time."

  • Csound1 Level 8 (46,982 points)

    Keeping your Mac plugged in most of the time is fine, ignore advice to the contrary. Keeping it plugged in all of the time would not be but as you don't it is not a factor here.


    For the age and useage of your Mac 80 to 90% is right in the ballpark.