Concerned on current battery capacity

i have had my mbp 13 for exactly a month now and the battery capacity is now at 92-93%. It now has 21 load cycles! i dont know if im doing anything wrong but i do use it for school(uses AC adapter) and at home(Ac adapter also). When using battery i only deplete it around 50%~. and according to coconut battery, i now have 5096 mAh compared to the original 5450mAh. Is there something wrong?
ps: my friend also has a mbp and his is refurb, but its still holding the original mAh and has less load cycles.
thanks in advance

I too have concerns about my new battery.
I've had it for a week, it's at 6 charge cycles (no worries abotu that)
my paranoia comes in when i look at battery capacity.
I haven't gone past 97% and it plays around 95-96% of battery capacity. Is this normal for a new machine? I'd be expecting nothing less than 100% battery capacity for something new out the box.
And yes, ive done calibration, but still doesnt manage to get to its maximum charge capacity.
Can i expect things to improve? I know this might seem unnecessary if it's at all normal, but then again, I just want to see a new thing display perfect and new specs.
Thanks guys

Similar Messages

Current Battery Capacity Discrepancy?

I'm confused.
My computer is functioning perfectly, just that the battery is a little bizarre.
I use coconutBattery to determine charge capacity and stuff.
It tells me that the current battery capacity (4422 mAh) is higher than the original battery capacity (4400 mAh).
It is still the original, stock battery (it fell outside of the recall). Could the app just be reading it wrong, or what?

Goo goo gajoob, YMC. I don't think you have anything to worry about. The nominal 4400mAh capacity of your battery is only an approximation, and its indicated capacity is so close to it that I suspect it is an accurate actual reading.
We occasionally hear from folks whose batteries are reported to have capacities in excess of 12,000-20,000mAh. They clearly aren't getting good readouts, and need to replace their batteries. One indication of a very old, tired battery is an inability to report its condition properly.

10 Week Old MacBook & Current Battery Capacity already at 94%

Hello everyone, I recently bought a new macbook (11/09) and mainly use it thru its power adapter, although I do use the battery occasionally. Yesterday I decided to perform a battery calibration and it went as follows: The battery was fully charged when I unplugged the computer from it's power supply (the original battery capacity also showed 100% via Coconut). I took the battery all the way down to about 1% then re-charged it completely only to return and see that the Current Battery Capacity is 94%. I've only had 10 load cycles in the 2.5 months I've had it. Here's my battery info:
Battery Information:
Model Information:
Serial Number: W0943KWNJ9X7A
Manufacturer: SMP
Device name: bq20z451
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0103
Hardware Revision: 000a
Cell Revision: 0130
Charge Information:
Charge remaining (mAh): 5163
Fully charged: Yes
Charging: No
Full charge capacity (mAh): 5163
Health Information:
Cycle count: 10
Condition: Normal
Battery Installed: Yes
Amperage (mA): 0
Voltage (mV): 12530
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 20
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
Battery Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 3
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: 0x0050443a
Charging: No
Power Events:
Next Scheduled Events:
Type: Sleep
Scheduled By: Repeating Event
Time: 1/24/10 11:45 PM
Is there something going on with my battery or is it normal to lose 6% on a calibration? As I said, I have been typically using it with the power cord connected vs. just the battery. Any insight would be greatly appreciated. Thanks.

You should take it off the charger every so often, so the battery can drain and recharge. That will help some.
I can't see losing 6% of the battery as new. However, I also don't know how long the MacBook sat there prior to your purchasing it, etc. So while it seems odd, it also isn't outside the realms of possibility.
Doc

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.

Battery Capacity Question

This morning my battery capacity was at 48% after I calibrated it over night due to the system profiler telling me to "check battery." After using my computer for a little while without it being plugged in, my battery was down to about 45min remaining for power. Then I closed the lid and put it to sleep. After about an hour I opened it and immediately the message popped up saying that my computer was running on reserve power and I should plug it in. Now, my current battery capacity is at 26%.
Does anyone know why this has happened? Should I just get a new battery?
Thanks!

It means that you most likely need a new battery. If your computer is still under warranty then bring it there. If it's out of warranty, then you might have to pay. If your battery has less than 300 charge cycles then you can ask if they are willing to replace it for free or a minimal charge since Apple said their battery should held 80% life after 300 cycles.

Battery capacity very low, despite careful use and maintenence

Hello,
The current battery capacity of my MacBook Pro seems to be diminishing rather swiftly. I bought my Mac around 4 months ago, and have been using it for less than 3 months. I try to run Battery Calibration often (sometimes many times in a row, just because the situation allows for it), and I have never started charging it until it has went into standby due to low power. I tend to use it when running on battery, though I do occasionally keep the power-cord plugged in when fully charged.
The problem is, my overall battery life is down to 93% of the original, only with 63 loadcycles. That's not the worst part - it has recently been going down even quicker then before when 98% or so worried me.
I have kept a log of the life of my battery using CoconutBattery, it is as follows (in order from earliest to most recent):
98 % (5440 mAh) 2007-09-06
99 % (5464 mAh) 2007-09-09
98 % (5410 mAh) 2007-09-10
98 % (5440 mAh) 2007-09-12
98 % (5444 mAh) 2007-09-13
99 % (5450 mAh) 2007-09-13
99 % (5450 mAh) 2007-09-15
99 % (5463 mAh) 2007-09-15
98 % (5420 mAh) 2007-09-17
98 % (5429 mAh) 2007-09-19
98 % (5443 mAh) 2007-09-21
98 % (5392 mAh) 2007-09-21
97 % (5387 mAh) 2007-09-22
97 % (5360 mAh) 2007-09-26
97 % (5352 mAh) 2007-10-01
97 % (5387 mAh) 2007-10-04
100 % (5544 mAh) 2007-10-15
97 % (5339 mAh) 2007-10-16
96 % (5292 mAh) 2007-10-17
98 % (5437 mAh) 2007-10-19
95 % (5242 mAh) 2007-10-21
93 % (5143 mAh) 2007-10-23
Why are there so many jumps in percent, both up and down? How can I improve on my battery capacity? Can I anyhow make it increase back to the full 100%?
Is it better to keep it plugged-in or use the battery? Is the OK to charge it often?
Thank you for your time. I hope you can help!
Rudi

It doesn't say that on the apple site!
You're right, it doesn't. It in fact actually implies the opposite…
"Standard Maintenance
For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Apple does not recommend leaving your portable plugged in all the time. An ideal use would be a commuter who uses her MacBook Pro on the train, then plugs it in at the office to charge. This keeps the battery juices flowing. If on the other hand, you use a desktop computer at work, and save a notebook for infrequent travel, Apple recommends charging and discharging its battery at least once per month."
http://www.apple.com/batteries/notebooks.html
Thing is, this text is aimed at those that rarely use their batteries as opposed to that those that do given that with regular battery use you're already doing the right thing.
Additionally, by regularly using your battery the function a calibration is actually relegated to a way of accurate reporting. Over time the cells degrade and the battery's circuitry as well as your MBP's SMC gets out of sync with this which results in incorrect battery run time figures. In the worst case this irregularity can result in your MBP shutting off without warning as it thinks it has more power than it really does. Calibration just lines this all back up again.
This does not mean you shouldn't calibrate but to do it only every now and then. I have an iCal to-do item to do it after 6 weeks from the last one although it can actually mean I don't do it for 8-10 weeks.
maybe change the battery - if so, will I still be able to purchase a new battery for my current SR model? Or should I buy one and keep it in stock now?
Assuming Apple changes the MBP battery on it's next revision you'll still be able to purchase new batteries for your MBP. While they don't make then indefinitely they won't leave us high and dry without a source of new batteries even after a line is not longer current.
Buying new batery is not recommended until you actually need it as Li based batteries degrade from the time they're made so the newer the stock the better.

My battery has a current max capacity of 97% after only 2 month ...

Hi everyone.
I don't know if I'm a little bit paranoid but I just checked the current max capacity of my battery (Macbook Pro 2012 13") with different softwares as Battery Health or Battery Guard (available on the App Store) and it reads 97% after only 2 month and 3 cycles ... Is it normal?
I'm kinda worried, the loss of capacity seems so fast, to me ...
More details : this capacity was 100.6% just before I tried to calibrate it. I followed the advices of Battery Health :
1) Charge the battery until 100%, then wait 2 hours with the Macbook plugged
2) Use it, until it shuts down by itself, then let the Macbook 5 hours at least without charging it again
3) Charge the Macbook until 100% again
After this manipulation, my max capacity lost 3 percent ... Is this something I did? Is it normal?
Does the Macbook have to calibrate his battery again? Then, what's the manipulation to do to calibrate it (I looked for it on the Apple website, but I can't find a step-by-step)?
Thank you all

Battery capacity degrades over the life of the battery for a lot of reasons and will fluctuate from day-to-day by a percent or two. Instead of using apps to read the battery, you can get all the info you need right from the system itself. Click the apple in the upper left corner, About This Mac, More Info, System Report, Hardware, Power and then just read the battery Capacity, charge Cycles, Condition, and Voltage. As long as the Condition is Normal you are fine.
Although Apple says to calibrate the battery by discharging to shutoff and then recharge, that in reality is not good for Lithium-technology, and it does not calibrate the battery, it calibrates the charge reporting circuitry.
If you go to the Battery University site, an independent group that has done a lot of studies of batteries, you can find information on prolonging Lithium-technology battery life. One thing that is clear is that deep discharge cycles are very degrading on battery life. Optimum balance of use/life seems to be around a discharge to 50% and then recharge. Also, temperature is a major player in shortening battery life.
At thiis point, don't get too hung up on the battery capacity, use the MBP and enjoy it.

Mid 2010 MacBook Pro battery capacity at 89% with 64 cycles

Hello everyone,
I have a 13" mid 2010 MacBook Pro that I got around Christmas time. I downloaded coconutbattery a couple days ago and when i used it then My battery capacity had been 91%. So I thought that this was odd because of how new the computer is still (15 wks old with 64 battery cycles) so I read about how the battery needs to be recalibrated from time to time and after doing so (followed the directions perfectly) My capacity is now down to 89%. Should this be something to be concerned about or is this normal?

It's quite normal and sometimes a recalibration can see things go up as well as down

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.

2 day old MacBook Pro at 98% battery capacity

I'm a little bit concerned about the lifespan of my new MacBook Pro's battery. When i recieved the machine i performed a battery calibration as Apple recommends. I then charged and discharged again. I was concerned when Coconut battery (not always accurate) told me my battery was at 98% total capacity. Is this normal? after 2 cycles my capacity is down 2% .
I'm surprised because I've never seen this on my old iBook which usually loses 1% capacity per month.
I've read that these lithium ion batteries have a memory, that the cells not being used stop functioning because they are not needed. Is this true?
When at home should i keep the machine plugged in? My iBook used to be fine when i took it to school and drained it, then charged it at night. Opinions?

More or less, yes, I do. Actually turns 5-days old today and at 97.8% of capacity (5330 mAh compared to 5450 when new) after 4 battery loadcycles. Coconutbattery says this is 97%, but my math is a bit higher at 97.8%. Clearly this rate of decline is not sustainable.
So my question to you was, did "don't worry, enjoy" mean that in your experience, the initial few percentage points of battery capacity is blown off quickly, but the battery capacity will quickly stabilize to something that is still acceptable?
My battery on a full charge this morning (day 5 of ownership) lasted 3:50, with display at 50%, no use of the optical drive, Wifi on, bluetooth off, and running Mail, Safari, Firefox, iCal, Excel & Activity Monitor (to keep an eye on things). No work was done in Excel, Firefox or iCal, just Mail & Safari. So, I, too, am a bit concerned about being nowhere near 7 hours. Or 5 hours, for that matter. So, short battery life and losing 2.2% of capacity in 4 loadcycles and 5 days is concerning, and tempting to connect the dots.

How to INCREASE Battery Capacity

Just drop the advertising - I know that battery capacity varies, and that the capacity of the phone battery - regardless of models, will degrade as the phone is used.
I contest the "specialists" to provide some straight simple guidelines to how one can treat a battery to increase the capacity.
That the layers gets closer and short-curcuits is a known reason. So, exposure to heat will make the substance that keep the layers apart into gas that escapes the battery. Now how can such a battery be fixed? In old days with NiCd we could freeze the battery to -36C, that would make the iodine to solid. if iodine is still used, this will still work. Other semiconductors needed more than -100C to regain state - but with access to liquid Nitrogen, that was fully possible. Maybe Ni is not so common, but freon is, and LPG (Butane/Propane liquified). A home freezer can at times go as low as -38C.
So, can charging in heat / cold change the capacity of the battery?
Other: If I completely drain the battery between every charge - will that improve it?
If I start to recharge it when it is 80% of capacity, and disconnect immediately and use everything, Bluetooth, WLAN - to drain it to 80% and the recharge - can I restore the good old capacity?
if the battery degrades to 10% of capacity, is it possible to restore it? How?
Don't change anything that works.

That, and I've been reading to not constantly charge it, or leave it in at 100%. It can be charged too much from what I've seen. I've had mine since 2006 almost 2 years, and till recently left it charging all the time. Not sure that's been a good idea. This is Battery University website information...
gure 1: Permanent capacity loss of lithium-ion as a function of temperature and charge level.
High charge levels and elevated temperatures hasten permanent capacity loss. Improvements in chemistry have increased the storage performance of lithium-ion batteries.
The mentioning of limited service life on lithium-ion has caused concern in the battery industry and I will need to add some clarifications. Let me explain:
If someone asks how long we humans live, we would soon find out that the longevity varies according to life style and living conditions that exist in different countries. Similar conditions exist with the batteries, lithium-ion in particular. Since BatteryUniversity bases its information on the feedback from users as opposed to scientific information derived from a research lab, longevity results may differ from manufacturer' specifications. Let's briefly look at the various living conditions of the lithium-ion battery.
The worst condition is keeping a fully charged battery at elevated temperatures, which is the case with running laptop batteries. If used on main power, the battery inside a laptop will only last for 12-18 months. I must hasten to explain that the pack does not die suddenly but begins with reduced run-times.
The voltage level to which the cells are charged also plays an important role to longevity. For safety reasons, most lithium-ion cannot exceed 4.20 volts per cell. While a higher voltage boosts capacity, the disadvantage is lower cycle life. Figure 2 shows the cycle life as a function of charge voltage.

What is the original battery capacity in mAh for MBPr?

My laptop battery is very poor (4 hours) in %25 birghtness.
My Original battery capacity is 8400 mAh
Cycle count 5
What is the original battery capacity of the laptop should be?

When I charge my battery, brand new rMBP it says design capacity of 8460, current capacity of 8565, but current charge of only 8142.. why would they all be different?

Macbook Pro MD101 battery capacity

Hi,
I've bought a new Macbook Pro MD101 for a month ago. Everything go fine until I checked the System Report and saw that the Battery Capacity is 5166mAh, different from the others MD101 are about 5700 or higher. What's the problem?
Thanks

The capacity always declines with use, and fluctuates on a daily basis. If you check it in a couple days it may be more than your current value. They float up and down a good amount.
More important is the Condition...that should always be Normal or have it checked.

How much is Macbook pro battery capacity?

Hey
I just wanna know how much is Macbook pro 15 inch battery capacity in mah?
thanks

After you read Barney-15E's advised source, you can download "coconut battery" from "macupdate.com".
Mine is below, and it show design capacity, current capacity, current stored charge.

20 month old MBP with only 80% battery capacity

Been noticing my 09 alu uni body 13" MBP now has a battery capacity of just 80%, according to Coconut Battery. I realise this app might not be too accurate, but I only checked it as I've been noticing a reduction in battery life recently.
I've been using MB's for years and employ all the usual good practices, I also regularly recalibrate the battery, although I understand these new non-replaceable models don't require it, nonetheless, it can do no harm.
My question is, is such a reduction in the batteries capacity normal on this machine after just 20 months use?
BTW- The use consists of running on mains at work during working hours, resting over night during the week, use on battery/mains at home at the weekend. According to Coconut the battery has had 348 cycles. Again, no idea how accurate this app is!
I have 3 years cover on the machine, so it it's deemed this is not usual I can pay the Apple store a visit, but I'd be interested in the views of other users whether this is normal or not.
Thanks.

If you think that's necessary. But losing 20% capacity in almost 2 years is pretty good for any battery. It's just that we can monitor it more accurately now.
You can get your current capacity vs design capacity via Terminal without coconut:
ioreg -l | grep Capacity
^that's a -L and then a |

Concerned on current battery capacity

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