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rhaezorblue

macrumors 6502
Original poster
Sep 18, 2012
429
332
Still in my 14 day return window, would you return and repurchase a Macbook Pro 13", which is supposed to have a battery design capacity of 6330 mAh, if you never hit that intended capacity? Here are some data points for mine per coconut battery:

Update: the chart shows what OS X is reporting as my batteries current Maximum charge (not what my battery is currently charged to.. for example those data points I could have had 4% or 95% current battery life remaining, but those data points represent what the macbook thinks my batteries MAXIMUM capacity is, at its current health.
 

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Samuelsan2001

macrumors 604
Oct 24, 2013
7,729
2,153
I wouldn't

I wouldn't that is pretty close to what you expect and if my battery life was good I wouldn't even think about it. Also you only have 4 charge cycles and from the way that chart looks you are only letting it discharge to about 90% before plugging it in again. Let it run right down maybe even discharge just this once and then charge right up overnight you may find it's much better.
 

rhaezorblue

macrumors 6502
Original poster
Sep 18, 2012
429
332
I updated my post to be more clear - I am draining the battery - the graph just shows what OS X thinks my batteries current maximum capacity is, based on its current health. It is not what my battery is currently charged to.
 

Brian Y

macrumors 68040
Oct 21, 2012
3,776
1,064
I updated my post to be more clear - I am draining the battery - the graph just shows what OS X thinks my batteries current maximum capacity is, based on its current health. It is not what my battery is currently charged to.

That seems pretty normal. The health will fluctuate based on several different parameters (even heat, for example).

Some report over capacity, some report under capacity. As a general rule of thumb, those under capacity will lose capacity slower, those over capacity will lose it quicker - so they all average out.

I would just use the machine. If you notice it drops considerably, your warranty will sort it out.
 

BenTrovato

macrumors 68040
Jun 29, 2012
3,037
2,202
Canada
That's a higher percentage than my new MBA got when I purchased it in 2012. But it did stay consistent afterward. If everything else is perfect with the laptop I would keep it. If the battery is drooping off rapidly then you can just warranty it.
 

cjmillsnun

macrumors 68020
Aug 28, 2009
2,399
48
That seems pretty normal. The health will fluctuate based on several different parameters (even heat, for example).

Some report over capacity, some report under capacity. As a general rule of thumb, those under capacity will lose capacity slower, those over capacity will lose it quicker - so they all average out.

I would just use the machine. If you notice it drops considerably, your warranty will sort it out.

On 4 cycles??? No way.
 

Brian Y

macrumors 68040
Oct 21, 2012
3,776
1,064
On 4 cycles??? No way.

Cycle count has nothing to do with it. It *can* fluctuate based on things like the temperature and current charge level (a half empty battery will often report a lower "capacity").

So you would suggest returning a MacBook because a battery which has a design capacity of 6330 has a capacity of 6312.
 

rhaezorblue

macrumors 6502
Original poster
Sep 18, 2012
429
332
I was doing some gaming and it went down to about 6120 max capacity, when I stopped and returned to the desktop for a couple mins it has gone back up to 6226 mAh. I have no idea if this is normal
 

simonsi

Contributor
Jan 3, 2014
4,851
735
Auckland
I was doing some gaming and it went down to about 6120 max capacity, when I stopped and returned to the desktop for a couple mins it has gone back up to 6226 mAh. I have no idea if this is normal

All batteries exhibit lower effective capacity at higher drain rates. Your system is normal, fluctuation is normal based on various factors. No it is not the slightest reason to exchange it.
 

rhaezorblue

macrumors 6502
Original poster
Sep 18, 2012
429
332
All batteries exhibit lower effective capacity at higher drain rates. Your system is normal, fluctuation is normal based on various factors. No it is not the slightest reason to exchange it.

Ok, accepting fluctuations as normal, but shouldn't there be at least some points where my max capacity is 6330 mAh?

Anyone out there have a rMBP 13" mid 2014, what is your maximum capacity?
 

simonsi

Contributor
Jan 3, 2014
4,851
735
Auckland
shouldn't there be at least some points where my max capacity is 6330 mAh?

When the temp and other variables closely match Apples test criteria I'm sure it will do but so far you are so close it makes absolutely no difference. You will get far more variation is useful battery runtime from your choice of apps running etc.

Run it for a few days more and see where it goes...
 

rhaezorblue

macrumors 6502
Original poster
Sep 18, 2012
429
332
I let it run down to empty last night and let it sit overnight, now charging up to full to calibrate it. Will see how it goes
 

rhaezorblue

macrumors 6502
Original poster
Sep 18, 2012
429
332
http://support.apple.com/kb/HT1490

MacBook Pro (all models)

The battery calibration for the PowerBook G4 (15-inch Double-Layer SD) and any model of MacBook or MacBook Pro has been updated because of a new battery released with this computer. With these computers, follow these steps to calibrate your battery:

Plug in the power adapter and fully charge your PowerBook's battery until the light ring or LED on the power adapter plug changes to green and the onscreen meter in the menu bar indicates that the battery is fully charged.
Allow the battery to rest in the fully charged state for at least two hours. You may use your computer during this time as long as the adapter is plugged in.
Disconnect the power adapter while the computer still on and start running the computer off battery power. You may use your computer during this time. When your battery gets low, the low battery warning dialog appears on the screen.
At this point, save your work. Continue to use your computer; when the battery gets very low, the computer will automatically go to sleep.
Turn off the computer or allow it to sleep for five hours or more.
Connect the power adapter and leave it connected until the battery is fully charged again.
Tip: When the battery reaches "empty", the computer is forced into sleep mode. The battery actually keeps back a reserve beyond "empty", to maintain the computer in sleep for a period of time. Once the battery is truly exhausted, the computer is forced to shut down. At this point, with the safe sleep function introduced in the PowerBook G4 (15-inch Double-Layer SD) computers, the computer's memory contents have been saved to the hard drive. When power is restored, the computer returns itself to its pre-sleep state using the safe sleep image on the hard drive.
 

ayeying

macrumors 601
Dec 5, 2007
4,547
13
Yay Area, CA
http://support.apple.com/kb/HT1490

MacBook Pro (all models)

The battery calibration for the PowerBook G4 (15-inch Double-Layer SD) and any model of MacBook or MacBook Pro has been updated because of a new battery released with this computer. With these computers, follow these steps to calibrate your battery:

Plug in the power adapter and fully charge your PowerBook's battery until the light ring or LED on the power adapter plug changes to green and the onscreen meter in the menu bar indicates that the battery is fully charged.
Allow the battery to rest in the fully charged state for at least two hours. You may use your computer during this time as long as the adapter is plugged in.
Disconnect the power adapter while the computer still on and start running the computer off battery power. You may use your computer during this time. When your battery gets low, the low battery warning dialog appears on the screen.
At this point, save your work. Continue to use your computer; when the battery gets very low, the computer will automatically go to sleep.
Turn off the computer or allow it to sleep for five hours or more.
Connect the power adapter and leave it connected until the battery is fully charged again.
Tip: When the battery reaches "empty", the computer is forced into sleep mode. The battery actually keeps back a reserve beyond "empty", to maintain the computer in sleep for a period of time. Once the battery is truly exhausted, the computer is forced to shut down. At this point, with the safe sleep function introduced in the PowerBook G4 (15-inch Double-Layer SD) computers, the computer's memory contents have been saved to the hard drive. When power is restored, the computer returns itself to its pre-sleep state using the safe sleep image on the hard drive.

Also from that link, it states clearly:

Portables with built-in batteries
Current Apple portable computer batteries are pre-calibrated and do not require the calibration procedure outlined in this article. These computers use batteries that should be replaced only by an Apple Authorized Service Provider.

MacBook

MacBook (13-inch, Late 2009) and later
MacBook Air

MacBook Air (all models)
MacBook Pro

MacBook Pro with Retina display (all models)
MacBook Pro (13-inch, Mid 2009) and later
MacBook Pro (15-inch, Mid 2009) and later
MacBook Pro (17-inch, Early 2009) and later
 

rhaezorblue

macrumors 6502
Original poster
Sep 18, 2012
429
332
Ahh you are right. Well maybe getting a few more cycles on it will improve things. If not then returning it I guess
 

rhaezorblue

macrumors 6502
Original poster
Sep 18, 2012
429
332
LOL then they need to read their own material.

Updated with a few more days of data.. and having some fun playing around with Numbers graphing capabilities lol.

Pretty sure this does not look like a good battery at this point. Red line is the trend line.
 

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HotIce

macrumors regular
Oct 7, 2014
113
0
On 4 cycles??? No way.

I'm on 8 cycles and my coconut battery is showing my maximum charge at 92.4% and my design capacity at 98.8%. When I first booted up my laptop for the first time, it showed both at 100.9%

I've seen both hit 70% but after a charge, went back to 99%.
 

simonsi

Contributor
Jan 3, 2014
4,851
735
Auckland
Updated with a few more days of data.. and having some fun playing around with Numbers graphing capabilities lol.

Pretty sure this does not look like a good battery at this point. Red line is the trend line.

Charge it up fully and see what it says about capacity, it can be nothing but an estimate at any other time. I think you may have an issue with Coconut battery not having enough data to go on, days of usage isn't enough, it will only get a true reading of capacity when fully charged.

Oh and the axis of the graph is chosen to try and indicate a problem both in severity of slope of the trend and absolute value, try plotting the full Y-axis and it will look a minor issue.
 

rhaezorblue

macrumors 6502
Original poster
Sep 18, 2012
429
332
Charge it up fully and see what it says about capacity, it can be nothing but an estimate at any other time. I think you may have an issue with Coconut battery not having enough data to go on, days of usage isn't enough, it will only get a true reading of capacity when fully charged.

Oh and the axis of the graph is chosen to try and indicate a problem both in severity of slope of the trend and absolute value, try plotting the full Y-axis and it will look a minor issue.

I'll charge it up to full tonight and let you know - I'm using an app called Battery Health to verify coconuts readings - they have been the same like 99% of the time. I think they may get their data straight from the SMC

I have no clue what your second paragraph meant lol
 

mdlooker

macrumors 65816
Mar 7, 2011
1,227
203
US
Mine is sitting pretty good..

It's a 2014 13" rMBP
 

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gngan

macrumors 68000
Jan 1, 2009
1,829
72
MacWorld
Do people seriously need to look at the battery every second? If your number is off by 0.1% then you should just replace it? Not saying it isn’t faulty nor to be as advertise but if the difference is so minimal then just use the darn thing.
 
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