Any explanation about battery capacity?

My MBP Retina display is 2.9 month old, 43 loadcycles. So, my concern is that today i saw the following information about my battery capacity, which is: currenty capacity 8519 mAh and and design capacity 8460 mAh. Someone can tell me anything about this? appreciate!

Your battery has marginally more capacity than the design predicted, don't worry it is fine, and it will decay anyhow.

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  • MacBook Pro Mid 2010 Battery Capacity

    I've read a few threads about this, mostly about battery capacity rapidly dropping after an install of ML. I installed ML when it first came out, and just noticed the drastic decrease in battery life about 3 weeks ago. My capacity could have potentially been dropping since I installed ML (and I just now noticed it), or it may have just started a couple weeks ago when I noticed. I'm not sure.
    Either way, my MacBook Pro (Mid 2010) now has a battery life of less than an hour, even with extremely light processor load. I contacted Apple about this, and the tech said that the battery was rated for 1000 cycles. I'm currently at 220, and my battery capacity is a pathetic 30%. He said that since I wasn't under warranty, there was nothing they could do besides replace the battery - which I really want to avoid since I'm a broke college student.
    Is there anything I can do here? I understand that I'm not under warranty anymore, and this wouldn't be a problem if my battery was degrading normally. However, getting 1/5th of the recommended battery life is pretty sad. I've read that doing a clean install of Mountain Lion/Lion might help. Is there a way I can do this without having to back up all my files? I don't have an external hard drive or anything.
    It seems this is a common topic in these forums. Any help or links to solutions would be great. If this is answered in a similar topic, I'll gladly delete.
    Here is the system info on my battery, incase that might help:
    Battery Information:
      Model Information:
      Serial Number:          9G030040MD3MA
      Manufacturer:          DP
      Device Name:          bq20z451
      Pack Lot Code:          0
      PCB Lot Code:          0
      Firmware Version:          201
      Hardware Revision:          2
      Cell Revision:          158
      Charge Information:
      Charge Remaining (mAh):          1453
      Fully Charged:          No
      Charging:          Yes
      Full Charge Capacity (mAh):          1939
      Health Information:
      Cycle Count:          220
      Condition:          Service Battery
      Battery Installed:          Yes
      Amperage (mA):          1507
      Voltage (mV):          12214
    System Power Settings:
      AC Power:
      System Sleep Timer (Minutes):          0
      Disk Sleep Timer (Minutes):          10
      Display Sleep Timer (Minutes):          15
      Wake on AC Change:          No
      Wake on Clamshell Open:          Yes
      Wake on LAN:          Yes
      Current Power Source:          Yes
      Display Sleep Uses Dim:          Yes
      PrioritizeNetworkReachabilityOverSleep:          0
      Battery Power:
      System Sleep Timer (Minutes):          15
      Disk Sleep Timer (Minutes):          10
      Display Sleep Timer (Minutes):          10
      Wake on AC Change:          No
      Wake on Clamshell Open:          Yes
      Display Sleep Uses Dim:          Yes
      Reduce Brightness:          Yes
    Hardware Configuration:
      UPS Installed:          No
    AC Charger Information:
      Connected:          Yes
      ID:          0x0100
      Wattage (W):          60
      Revision:          0x0000
      Family:          0x0085
      Serial Number:          0x00cb7bc3
      Charging:          Yes
    Thanks in advance

    Condition:
         Service Battery
    You need a new battery.

  • Concerned about falling battery capacity on rMBP

    Hello all, I'm starting to worry a bit about my battery capacity vs design capacity on my retina macbook pro 15". It's a early 2013 model that I bought in July. I know that apple guarantees the battery will have at least 80% of it's design capacity after 1000 cycles, but I'm worried mine is going to fall far short of that. Here's my coconut battery info:
    As you can see, I've only had 60 cycles on the battery, the computer is barely half a year old, and it's already down 6%, under 8000 mAh. Should I be concerned/take it to the apple store? I know they won't replace my computer since I'm far outside of my 14 days, but still wondering if they'll do something. Will they even do anything before the battery falls below 80% design capacity?
    I waited to post because I know battery capacity often fluctuates from 5% below to 5% above design frequently and will go up and down with use, but mine has steadily decreased, and has never increased. Every time I check coconut battery, it's 10-50 mAh lower than it was. My macbook does stay plugged in a lot, but I also make a point of using the battery at least once a week to keep the electrons flowing, and most weeks it gets off the charger more like two or three times. Often the battery will get used down to at least 50 or 60 percent before it gets plugged back in, sometimes even as low at 15 or 20 percent. I've tried draining it until it goes to sleep and then letting it charge to full again, but it didn't change anything. I didn't think it would, since lithium based batteries don't suffer memory issues, but I thought maybe it was just an error in measurement by the system.
    Speaking of that, I did reset the NVRAM/PRAM and the SMC (multiple times). Only one of the times I reset the SMC did the light turn orange and then charge more, but it didn't change the max capacity number at all.
    I see a lot of people posting their cocunut results/system information screen and finding they actually have above design capacity. Did I just get a lemon battery, or is it because I have it plugged in so much?
    Thoughts? Thanks!

    Apple guarantees that if your battery is well taken care of and not abused,  however your battery looks fine.
    You state: ~ As you can see, I've only had 60 cycles on the battery
    Cycle counts dont account for much.  People (some) leave their macbooks always hooked on power and worse still in sleep mode and on power and this can ruin a battery in "50 cycles", ergo it means little.
    As for the 5% power fluctuation this means absolutely nothing since charge is just an estimate and the 5% is within that range.
    Information:
    Bad discharging or battery use conditions:
    Heat (due to environmental conditions or due to rapid discharges from heavy use = gaming / video editing)
    Rapid discharging of the battery frequently causes chemical changes over time in the battery leading to decrease capacity and resistance of current flow.
    The very worst use of your battery is often draining the battery very low, and worse still letting it remain in such a state.
    *Most long-term rapid damage to the battery occurs from discharging it with high loading (gaming) conditions but paramount is avoiding deep and frequent low DOD (depths of discharge) in use.
    Undesirable charging or charged conditions:
    High perpetual SOC (state of charge), where the battery is always or very often connected to charge
    Parasitic loading where the battery is both usually on and charging or worse both always charging and in sleep mode, since this induces mini-cycling of the battery.
    Bad general handling conditions:
    Temperature use conditions when either too hot (95F and above) or too cold (50F and below)
    Storing your battery away with a low charge (40% and less) long-term.
    Considerations:
    Your battery is subject to chemical aging even if not in use. A Lithium battery is aging as soon as its made, regardless.
    In a perfect (although impractical) situation, your lithium battery is best idealized swinging back and forth between 25 and 85% SOC (state of charge) roughly.
    Further still how you discharge the battery is far more important than how it is either charged or stored short term.
    Ultimately counting charge cycles is of little to no importance.  Abuse in discharging (foremost), charging, and storing the battery and how it affects battery chemistry is important and not the ‘odometer’ reading, or cycle counts on the battery. 
    Everything boils down to battery chemistry long term, and not to an arbitrary number, or cycle count.
    Keep your macbook plugged in when near a socket since in the near end of long-term life, this is beneficial to the battery.
    http://www.apple.com/batteries/notebooks.html
    "Apple does not recommend leaving your portable plugged in all the time."
    General rule to remember of Lithium batteries is:
    Never drain them LOW  & dont always/often store them HIGH
    While cycle count is commonly seen to be the “miles” on your Lithium Ion pack cell in your Macbook, which they are, this distinction is not a fine line at all, and it is a big misconception to “count charge cycles”
    *A person who has, for example, 300 charge cycles on their battery and is recharging at say 50-60% remaining of a 100% charge has better battery usage and care than another person who has 300 charge cycles at say 15% remaining on a 100% charge. 
    DoD (depth of discharge) is far more important on the wear and tear on your Macbook battery than any mere charge cycle count.  *There is no set “mile” or wear from a charge cycle in general OR in specific.    As such, contrary to popular conception, counting cycles is not conclusive whatsoever, rather the amount of deep DoD on an averaged scale of its use and charging conditions.
    (as a very rough analogy would be 20,000 hard miles put on a car vs. 80,000 good miles being something similar)
    *Contrary to some myths out there, there is protection circuitry in your Macbook and therefore you cannot overcharge it when plugged in and already fully charged
    *However if you don’t plan on using it for a few hours, turn it OFF (plugged in or otherwise) ..*You don’t want your Macbook both always plugged in AND in sleep mode       (When portable devices are charging and in the on or sleep position, the current that is drawn through the device is called the parasitic load and will alter the dynamics of charge cycle. Battery manufacturers advise against parasitic loading because it induces mini-cycles.)
    Keeping batteries connected to a charger ensures that periodic "top-ups" do very minor but continuous damage to individual cells, hence Apples recommendation above:   “Apple does not recommend leaving your portable plugged in all the time”, …this is because “Li-ion degrades fastest at high state-of-charge”. This is also the same reason new Apple notebooks are packaged with 50% charges and not 100%.
    LiPo (lithium polymer, same as in your Macbook) batteries do not need conditioning. However...
    A lot of battery experts call the use of Lithium cells the "80% Rule" ...meaning use 80% of the charge or so, then recharge them for longer overall life.
    Never let your Macbook go into shutdown and safe mode from loss of power, you can corrupt files that way, and the batteries do not like it.
    The only quantified abuse seen to Lithium cells are instances when often the cells are repeatedly drained very low…. key word being "often"
    The good news is that your Macbook has a safety circuit in place to insure the battery doesn’t reach too low before your Macbook will auto power-off. Bad news: if you let your Macbook protection circuitry shut down your notebook at its bottom, and you refrain from charging it for a couple days...the battery will SELF-DRAIN to zero (depending on climate and humidity)…and nothing is worse on a Lithium battery being low-discharged than self-draining down to and sitting at 0
    Contrary to what some might say, Lithium batteries have an "ideal" break in period. First ten cycles or so, don't discharge down past 40% of the battery's capacity. Same way you don’t take a new car out and speed and rev the engine hard first 100 or so miles.
    Proper treatment is still important. Just because LiPo batteries don’t need conditioning in general, does NOT mean they dont have an ideal use / recharge environment. Anything can be abused even if it doesn’t need conditioning.
    From Apple on batteries:
    http://support.apple.com/kb/HT1446
    http://www.apple.com/batteries/
    Storing your MacBook
    If you are going to store your MacBook away for an extended period of time, keep it in a cool location (room temperature roughly 22° C or about 72° F). Make certain you have at least a 50% charge on the internal battery of your Macbook if you plan on storing it away for a few months; recharge your battery to 50% or so every six months roughly if being stored away. If you live in a humid environment, keep your Macbook stored in its zippered case to prevent infiltration of humidity on the internals of your Macbook which could lead to corrosion.

  • Is About this mac/more info/power reliable for battery capacity assessment

    Hi,
    I calibrated my brand new battery for my Alubook 15". Here are the results :
    First cycle : 4200 mah
    Second cycle : 4520 mah
    Third cycle : 4370 mah
    Fourth cycle : 4220 mah
    Fifth : 3920 mah.
    The battery was sold for 4700 mah.
    1. Does this get any sense ? would you worry about future battery performances based on this capacity decrease from the third cycle ?
    2. I have read that resetting PRAM may reset this battery power assessment to more reliable data : Any experience about this ?

    Luc --
    You raise some interesting points, at least one of which we debated (without resolution ;-)) prior to the change over to the New Discussions -- that concerned whether the batteries used by the new revision of PowerBooks were qualitatively different than the ones used by previous revisions. I don't think we came to a firm conclusion on this.
    But on two other points you raise we did at least draw some firm observations, if not flat out conclusions.
    The first has to do with the 10.4.3 update and whether it may have had power management effects for the better. I personally noticed a slight increase in my battery life since the update, which I have attributed (at least in part) to the fact that a process that runs almost all the time in the background (having, I think, something to do with the trackpad and related functions) called "kernel_task" now runs at about half the CPU usage that it used to. It used to regularly consume 7-8% of my CPU resources. Now, when I check in Activity Monitor, "kernel_task" regularly consumes about 2.5-3.5%.
    The second relates to the new PowerBook revisions, their greater stated battery life and any hardware changes made in them that may be responsible therefor. Here, I remember reading in several places on these Boards and elsewhere that the type of RAM used by the new PowerBook revisions, i.e., PC2-4200 DDR2 SDRAM (running at 333 MHz), while it may not necessarily be faster than the type of RAM used in the previous PB revisions (PC-2700 DDR SDRAM) (since both types of RAM are running at the same 333 MHz in each model), the DDR2 RAM used in the new revision PBs does consume significantly less power to run. Therefore, it seems to have heavily contributed to the new revision PB's claim to longer battery life. Indeed, I've read that since both RAM types run at the same speed in the PB, it was precisely because of the low power consumption signature of the DDR2 RAM that was the reason it was chosen for the new revision PBs.
    Well, good luck testing out your new PB and it's battery. Let us know how it all turns out and, of course, feel free to post back if we can be of any further assistance.
    Bonne chance! A bientôt.
    Oh, by the way, as for battery capacity and degradation over time and with use, you might find my own statistics to be of interest. I've run off battery power quite extensively since I got my PB in March of this year, and, after 164 complete cycles in about 9 months of use (including may times where the battery was completely drained), my original stated capacity of 4400 mAh has only decreased to 4228 mAh (using the same Apple battery that came with my PB when I first got it). I think that's pretty decent from what I've heard and seen with others.
    Later.
    -- JDee

  • Fluctuating battery capacity. can you give any tips to maintain my 596 cycles? (1 year old MBP 2012 13")

    battery capacity went from from 80.4% to 78% to 86%  within the same day. is this normal?
    i alraeady have 596 cycles
    1year old mac with applecare
    before i'am always draining my battery, now that i knew that it is bad, what should i do now?
    any tips and suggested routine?

    Here is a list of Apple support documents regarding batteries. 
    http://support.apple.com/kb/ht1446
    Look at the articles under the 'Optimizing battery life' category.
    Ciao.

  • Since I upgraded to iOS 7.0.4 on my iPad 3, battery capacity has drained almost 10%/hour without any use of the device. Prior to the upgrade, the battery charge would hold during periods of inactivity. What can I do to solve this significant problem?

    Since I upgraded to iOS 7.0.4 on my iPad 3, my battery capacity has drained almost 10% per hour without any use of the device. Prior to the upgrade, the battery charge would hold during periods of inactivity. What can I do to solve this significant problem? Is there a way to uninstall iOS 7.0.4 and return to the previous version?

    Downgrading isn't supported.
    You can poke around in the settings. There's a lot of stuff defaulted to on that you may not need, such as notifications.
    You can also look into background app refresh and background app updates. They can be running in the background and drain your battery.

  • HT1726 i have heard that charging less than 80 percent will make the battery lasts longer, does anybody have any idea about that?

    hi,
    i have heard that charging less than 80 percent will make the battery lasts longer, does anybody have any idea about that to help me?

    I don't know where you heard that statement but it's completely incorrect.
    According to Apple:
    Use Your iPad Regularly
    For proper reporting of the battery’s state of charge, be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).
    Elsewhere, Apple elaborates and explains that two half-discharges (or four quarter-discharges, etc.) equals one full discharge.

  • Is there any official explanation about why lumia ...

    What is going on here is,  We see huge debate between Nokia fans and Noida haters about Lumia 920's weight.
    People are expecting the official explanation about the ideas and reasons behind this design. 
    185g is quite heaiver than most of modern smart phone, why Nokia do that?

    It is "Heavy" because of its bigger frame that is consisted of Polycarbonate, glass, and ceramic unibody which gives it a durable build. Because of this build, a case is not recommended due to its near indestructable design. What also adds to the weight is supposedly the wireless charging coils that gives it the extra Umpf. 
    Lets put "this phone is too heavy" into a more relatable perspective.
    In terms of weight:
    iPhone 4 is 5 ounces.
    Lumia 920 6.5 ounces.
    Look at the popular iPhone 4 cases. Examples are the "Otterbox" and "Case-Mate Barely There Slim". The "Otterbox" is a solid 1.8 ounces, and the "Case-mate" case is 1.5 ounces. When one adds those numbers interchangeably with the 5 ounces of the iPhone 4, it can be said that the weight matches that of the Lumia 920 if not more.
    But wait you didn't add the case weight to the Lumia 920?
    -As stated above, it isn't recommended to have a case on it, unlike the iPhone series
    I don't even use a case for my iPhone?
    The vast majority of iPhone users do use iPhone cases. If you don't believe me, go out to the city and see for yourself. The ratio is quite obvious. And if you happen to not have a case on that iPhone, then I'll have no pity for you when it shatters at first impact. 
    Many iPhone users complain about the weight, but they forget that they've been decieved by the fact that they have been using a flagship phone for years that was atleast the same weight of the Lumia 920. 

  • My battery capacity decreases per charge!!!

    Hi guys I need help, I am very frustrated about this matter , This is my first macbook pro retine late 2013 the latest one out yet 4gb ram baseline model with the dubal core i5. I started playing LOL or League of Legends an online game a few weeks back.
    When I did start I was completely hooked and played multiple hours even with the battery charger plugged in. The battery lost its total capacity from 6300 its about 6200 then it fell 6150 ok then I statred carying ok I LOVE MY MAC AND ITS BATTERY.
    So i went like ok i will play max 40 mins per day, fine huh 1 time per charge cycle make sure the charge cycle is 20 hrs long I have been trying to do this more or less BUT EVEYTIME I PLAY THE GAME EVEN IF THE CHARGE drop is only 30% my total battery capacity drops.
    I am checking this through MULTIPLE apps and every time i play the drop is bloody 0.5 percent and i  CANT TAKE IT and when i dont play on a chrge cycle there is NO DROP IN THE OVERALL capacity.
    Note i take soo much care when i pay i charge it to 100 and keep it ice cold when  i play and its not plugged in. Any advice are the apps wrong is my capacity decresing are macs not meant for gaming or if i conture down this path will i have to eventully replace my battery just any adivce or thoughts on this matter will be VERY APPRECIATED!!!

    When Taxing the system, Running it Hard as most all games do, it will draw power from both the AC charger and the battery at the same time.
    The AC charger Apple supplies is not large enough to do both Power the system and charge the battery, or even keep the same charge on the battery, when the system is working hard.
    As to the overall capacity of the battery that will go down with the increase of charge cycles.
    What you are seeing is completely normal for all Mac notebook computers.

  • Battery Capacity after 3 cycles

    Hi all,
    I have a late 2013 rmbp. I've been reading up a lot on how to best treat the built in battery to maximize battery life. This laptop is only 1 week old and I've discharged once to about 40% and used the unit on batter a second time to about 50%. I'm now planning on using it on the power adapter mode when at my desk and using it on battery mode when going mobile. My question is though is that according to my coconut battery app, I'm already only at 97% max capacity! Is this normal? This battery has only been through 3 cycles of charging.
    The max charge went from 6330mAh to 6153mAh in the 1 week I've owned this computer. Since I'm new to the macbook world, I was wondering if this is normal and was hoping someone could give me some insight to how fast the Max Charge capacity drops over time in relation to the Design Capacity. I'm still within my return period if I need to return this computer :/
    For reference, my battery was manufactured 4/24/2014.
    many thanks!

    Read: https://www.apple.com/batteries/
    This laptop is only 1 week old and I've discharged once to about 40% and used the unit on batter a second time to about 50%. I'm now planning on using it on the power adapter mode when at my desk and using it on battery mode when going mobile. My question is though is that according to my coconut battery app, I'm already only at 97% max capacity! Is this normal? This battery has only been through 3 cycles of charging.
    The max charge went from 6330mAh to 6153mAh in the 1 week I've owned this computer.
    It's best not to concern yourself with this degree of detail. Over a long period of time, its maximum charge capacity will decrease. Over a shorter period of time its maximum charge capacity may decrease or increase. One week and three charge cycles is not enough to draw any conclusions about anything. Typically, the maximum capacity percentage will settle to a value in the mid - 90s and will stay there for a long time.
    Your MacBook Pro's battery is the product of decades of research and is going to last for years, perhaps for as long as you own your Mac, or want to own it before it eventually becomes functionally obsolete.
    All batteries are wear items that will eventually need to be replaced. Budget 50¢ a week for battery depreciation and you will have more than enough saved to replace it when the time comes.
    I'm now planning on using it on the power adapter mode when at my desk and using it on battery mode when going mobile.
    That's a fine strategy. Follow Apple's usage recommendations, but don't obsess over such minutia. On the other hand if you are seeking to indulge your paranoia concerning over- or under- charging your Mac, the proper methods by which you must obsess about its incessant need for proper care and pampering, and to hear admonishments about the a parade of horribles that will result in your failure to acquiesce to superstition and myth, your needs will be met in by a number of charlatans in a variety of fonts and garish colors. You will believe them because they will validate what you have already decided to be true.

  • Fluctuating Battery Capacity

    Yesterday my MBP had a funny turn relating to it's recognised battery capacity. I had been using it for most of the day on fairly boring tasks and I was running it on battery power when all of a sudden it shut down on me. I plugged in charger and fired it up and when I looked at the battery it was at 0% however the capacity had fallen by over 75%.
    Originally it was about
    93% of original
    4440mAh
    270 load cycles
    10months old
    All of a sudden it was
    16% of original
    762mAh
    I used System Profiler and Coconut to check the levels.
    I left it charging for a couple of hours until it said it was full then I turned it off. I let it cool, took the battery out, dusted it, polished it and put it back.
    When I turned the machine back on the battery capacity was back to 93% original.
    The basic question is has anyone seen this before? Quickly followed by software glitch or intermittent hardware fault.
    Cheers for any help.

    The design capacity of a new battery is often exceeded slightly by its actual capacity. You got a good one.
    My late-2008 MBP's battery has a design capacity of 4600 mAh, but it started off at about 4800 and still has never gone as low as 4600, after 11 months and 64 cycles. Right now it shows 4622.
    It isn't possible for your MBP to have operated on battery power for 24 hours without sleeping. Something is wrong, not with your battery but with your story.

  • Battery capacity rapidly falling

    SInce the battery update about 10 days ago my battery has been losing it's maximum charge capacity. I noticed that when unplugged the time remaining on my powerbook went from about 2hrs 30mins to about 1hr 30mins after the update.
    I downloaded CoconutBattery to monitor this and since Jan 13th, it has gone from 2440mAh to 1805mAh today (20th Jan). I have tried re-calibrating the battery and resetting the power manager (each several times), but this seems to make it worse!!
    My battery is 13 months old (15 according to Coconut battery) and has had 314 loadcycles.
    Is my battery failing and is this just a coincidence that this has happened just after the battery update?
    P.S. perhaps I should give my wife this powerbook and swap for her MacBook Pro when it arrives?
    15" G4 1.33GHz Powerbook   Mac OS X (10.4.4)  

    That thread doesn't solve my problem.
    After the Battery Update, I noticed that my battery capacity was much less than before, I then downloaded Coconut Battery and started recording the capacity. At that time (after the update) the capacity was 2440mAh (13th), it has declined pretty rapidly from then on (2190mAh on the 15th, 2097mAh on the 17th, and 1805mAh on the 20th). During this time I have tried recalibrating and resetting the PMU etc, and this actually seemed to make things worse?!
    I would assume that a decrease of 600mAh in one week is not what one would expect.
    My questions are:
    1. Is the battery failing?
    2. Is this related to the battery update?
    3. My battery has had 315 loadcycles, how many loadcycles should I expect from a battery before replacement?
    4. Is it possible to reset the battery? Or remove the update?
    Thank you for any assistance.
    Rob

  • Max battery capacity is sometimes 2 and sometimes 4 hours

    When my battery is fully charged and I disconnect the charger, the battery indicator shows about 2:35, most of the time. Sometimes it shows more than 4 hours. Has anyone else seen this? Does it fall under warranty?
    My Macbook is a 2.1 GHz, white, purchased in March, 2008. Still under Apple Care.

    Hi abelmann,
    One thing to consider in comparing my battery vs. your battery is that the battery information I posted is from one of the new 13" MacBook Pros with the higher capacity batteries. Given the information you posted a FCC of 5049 is very good. Have you been good about battery calibration?
    http://support.apple.com/kb/HT1490
    If you haven't done it recently, it might be worth doing. Regarding your question on battery coverage, you have a one-year limited hardware warranty on the machine from Apple that covers any failures due to manufacturing defects. Applecare extends that two mores to a total of three years from the date that the computer was purchased. There are specific qualifications that the battery must meet to be considered "defective" vs. "depleted" and you'll need to call into Apple for specifics.
    http://www.apple.com/batteries/notebooks.html

  • Battery capacity after 200 load cycles - what is normal?

    My battery capacity has been fairly steady at around 92%(5100 mAh) between cycles 125 and 200. I baby it and always use a cool pod to prevent overheating. Then, within 3 charge cycles, it dropped to around 4500-4600 mAh (82-84%). Apple care told me that their engineers consider this capacity as normal. Upon asking what would be considered as not normal, I was told Apple would not release this information. But it is general knowledge that Apple guarantees 80% after 300 cycles. Good luck if my battery will last that long at that level. After another 10 cycles, the battery is still at that 82% plus level.
    I am concerned about this sudden drop: is it the microchip on the battery, that is going?
    Message was edited by: Jürgen Kraus

    I've never heard, nor read that Apple "guarantees" anything like what you say. Apple claims:
    "Battery Lifespan
    For Apple notebooks with removable batteries — such as previous generation MacBook and MacBook Pro computers — a properly maintained battery is designed to retain up to 80% of its original capacity at 300 full charge and discharge cycles. You may choose to replace your battery when it no longer holds sufficient charge to meet your needs."
    There is not guarantee mentioned or implied in that statement. Whether any particular battery still has 80% life at 300 cycles is anyone's guess. It depends entirely on the manner in which it was used, operating temperatures it was subjected to and so on.
    IMO, if you are over 200 cycles and you are starting to feel that the battery is not holding sufficient charge for your needs, it's time to shop for a new one. Batteries are a consumable item - they will fail with enough time and use - that much is guaranteed. It is a function of unavoidable internal oxidation and degradation of chemical components, not of the "smart" battery control circuitry.

  • BATTERY CAPACITY LIFE status. NOT % of Battery Use. I found it once, can't find it again.

    I found and frankly was surprised to find Battery Capacity Life status on an AT&T iPhone 4. When I went to sell it and was making sure I had cleaned all the menu's. Now I can't find it again. I think it was under usage and diagnostics but it isn't now under the iOS 7. Anyone know how to find it now? I sell all our iPhones in the family and I like to post that when selling so the seller knows.

    20pawfarm wrote:
    thanks M'St'C for the response. This surprised me when I saw it as it seems that when selling phones, it should be one of the screen shots for buyer beware, but since that one phone I haven't found it again. I have sold about 10 phones and have 3 more now plus an iPad. So hoping someone knows how to find it again. Found several posts on other apps that can tell battery life and have mac guru in house that was surprised when I showed it to everyone, now none of us can find it.
    Still hoping someone knows how to without external app?
    Any chance this phone was previously diagnosed by Apple for any suspected battery issues?  Just wondering if you saw some legacy feature they applied during diagnoses that would not normally be there?

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