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Low battery capacity after calibration (102% -> 92% -> 85%)

Recently, I bought a new battery (twice) for a MacBook Pro Retina 13” (Early 2015) that was given to me and had a blown battery. The OS is an up to date Catalina. The battery was purchased from an Apple centric webshop in my country.

Immediately after installation, the maximum capacity was reported as 102% by Coconut Battery. Interestingly, both batteries report the same serial number and battery age (605 days). Cycle count of both batteries was 1 after installation. Since the iFixit guide recommended to calibrate the battery I went and immediately did so.

The result was, with both batteries, that there was a sharp maximum capacity drop after each calibration. I’ve tried draining it as slowly as possible, yet to no avail. After two calibrations the displayed maximum capacity was 87% / 86%. This is congruent with the output of “system_profiler SPPowerDataType”. The maximum capacity also varies by up to 6% depending on current load. I also notice that there are 3-4 drops of 3% displayed current capacity when draining the battery. Maybe cell switches? I don’t know.

Also, there’s a discrepancy of up to 5%, diminishing the more the battery is drained, between actual reported current capacity and the OS X display. This I gathered is normal.

Admittedly, I am confused. Did I get two bad batteries? Is this is a display bug in OS X since the runtimes still seem very high to me? Additionally, I’ve run “ioreg -l w0 | grep “BatteryData”” and now I wonder what the QmaxCell values of “6199”, “6237” and “6259” mean. Averaged, those result in a ~95% maximum capacity.

Furthermore, the “Amperage” value is reported as “18446744073709551398” which seems nonsensical to me. “PMUConfigured” is set to “0” - unsure what this means; excerpts from other people on the net show various values here.

I’ve also reset PRAM and SMC just to be sure.

I’m posting here in hopes that someone here has enough knowledge about the inner workings of the batteries in MacBooks. Any help would be greatly appreciated.

EDIT: Sorry for all the edits - just adding bits of info.

EDIT2: I’ve let the battery drain to 18%, and I’ve noticed that, starting from ~20%, the maximum capacity would start diminishing. After plugging in the charger, it shortly displayed 78%, and now sits at 84%! Something is definitely up here, and I don’t think it’s the battery (cells) that’s bad as such…

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It does sound like you got a set of bad batteries. I would return both and try another source.

Either the micro-controller within the battery is not working properly which is why both batteries failed or the controlling logic within your system logic board is damaged.

Are you using the original Apple charger or a knockoff?

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The charger is an original Apple charger I took from my company along with the MacBook they gave me for personal use. Currently, I am at 19% charge level, and I notice a relative drop of maximum capacity again. It seems as if going below 20% causes the battery to lose maximum capacity. The Qmaxcell averages out to 93.5% now.

It's all quite strange. I'm an experienced system engineer who, in earlier days, spent 3-4 years repairing (non-Apple) laptops / PCs and I've never had such an interesting behavior before, but due to a lack of experience with Apple products I'm a bit unsure about what is to be considered normal behavior and how Apple works in detail.

Thanks for your help! I'll contact the seller, tell them what's up and my suspicions, and that I want to verify things in greater detail first before sending back the second battery. Somehow, I think the battery is actually fine and that it's something else that's at play here - perhaps Catalina being difficult on old(er) MacBooks or a display error.

EDIT: Oh, and I'm not exactly sure on how exactly to do the calibration. Am I supposed to let the MacBook switch off after it goes to sleep? Should I switch it off forcefully once it enters sleep mode? Should I charge the MacBook whilst turned off after completely draining it, and if, how long? I suppose at least for an extra hour after the light on the MagSafe turns green?

さんによる

While the charger looks like an Apple unit it might not be! Here's a bit more on how to tell the difference OEM MagSafe Chargers vs Cheap Imposters: Teardown for Truth I've had people telling on a stack of bibles they have a real one and after testing it in front of them they are surprised!

No, you do have a problem! Often a reseller will get a gross of battery from the maker, and often all of the units within that order will be from the manufacturing run which was defective. I've personally seen this, I ordered 12 batteries and all 12 where bad!

The cells within the battery are wired together in series. There is no switches enabling or disabling the discreet cells.

A constantly diminishing battery capacity is a sign of a bad battery. A little at the start is normal and after calibration it should stabilize which clearly it hasn't

MacOS Catalina in its self won't alter the SMC logic. It only reports what SMC is telling it. As the OS is poling the SMC it can sometimes show a different value than CoconutBattery which likewise needs to poll SMC to get its data. But unlike the OS CoconutBattery needs to wait often as other higher priority processes need to go before it. Thats why you see the difference as the OS has a much higher priority.

I watch YouTube movies to wear down the battery for calibration and using CoconutBattery to monitor the state of the battery getting as low as I can before re-charging.

さんによる

According to the information in your link this is a genuine charger, so that should be covered. I'll contact the seller again at the end of the week to ask for a refund; I'll then order a battery from a different reseller. From personal experience getting two defective spare parts can really throw a wrench into one's thought processes, especially if unfamiliar with the given hardware.

About battery calibration: I've tried various ways to bring the charge down either in a manner close to actual usage or as slowly as possible, but when running the battery down it will eventually automatically enter sleep mode and there's no way to monitor the battery then. How exactly do you do it, then?

さんによる

There are different levels of sleep!

The deeper sleep is when you can't wake the system as the battery is too low. Thats the point you want to get to for calibration.

Sleep which can be worked with a keyboard or trackpad hit is not the deeper sleep. This is what no action of the system will get to when you walk away.

A running process like a video or music will keep it alive until the system can't run it. While it's not something I would used to calibrate there is a nice app called caffeinated - anti sleep app which I use when I'm writing as I sometimes sit back thinking a bit and hate having to wait for the system to wake to finish my thought.

A bit more detail on sleep!

Set newer portable Macs' sleep mode

Tech Tip: Should You Shut Down Your Mac or Let It Sleep?

Mac computer Sleep Indicator Light behavior

さんによる

Yes, I am aware of the different sleep levels. When I calibrated the batteries I let it drain to the point where no pressing of buttons would cause the system to respond, i.e. not even the "low battery" screen would show, since this, I assumed, was the point of complete discharge. I did so by disabling automatic sleep through the energy settings so that the MacBook would run indefinitely as long as it had power left. However, once at the point where the only thing the system would show is the low battery display, there was no way for me to measure the capacity left since the system will only show said screen. I assume that I did it correctly, then.

Hey, thank you for your help!

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Dennis さん、ありがとうございました!
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