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2.4GHz, 2.7GHz, or 2.8GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.8GHz) with 6MB shared L3 cache. Released February 2013.

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Battery disappears after Big Sur OS update?!?

My computer just updated the OS to 11.7.9 and the battery just freakin’ disappeared. On system info, it says there’s no battery

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. I did replace the battery a few months ago with an ifixit model but I just used it a couple days ago and it was fine.

things I tried - reboot. Reboot with nvram reset.

any ideas?

Update (08/13/23)

Hi @danj - thanks for the speedy response. I didn't get to installing Coconut Battery until this morning. Here's the screenshot from Coconut Battery. It's indicating:no-battery. I tried disconnecting the battery and reconnecting - still nothing. With the battery disconnected I also popped a Fluke multimeter between various test points on the battery circuit board to measure the voltages. Between the 0V, and 4V,8V, and 12V test points on the battery board all per the indicated correct values respectively. Voltage between the p+ and p- points on the board indicate 12 volts.

I suspect there was a toxic peripheral firmware upgrade bundled with this latest version of Mac OS that kills iFixit battery I installed a few months ago because the battery disappeared right after I took the latest OS upgrade.

Either that or I just got a bad battery pack from iFixit. TBH I can't remember if I bought this from iFixit or some other source. Regardless, it is odd though because it worked for months after I did the install.


Coconut Battery ScreenShot

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Let’s double check things, install this App as it sometimes sees thing a bit better CoconutBattery

Post a snapshot of the apps main window here so we can see.

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I added an update above per your input.

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@leifster - Well the batteries microcontroller is bad which is why things aren’t working. Dig through your paperwork to figure out where you got the battery as you’ll need a new one, sorry for the bad news.😫😩

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@danj - little update here. I left the old 2013 Macbook Pro unattended and unplugged for close to a year under my desk. I drag it off the slag-heap a few weeks ago for a trip to the Apple Store to get the battery replaced but discovered that the battery had reappeared and was charging normally. I was below 1% charge but working fine [hurray - celebration]. I ran coconut battery to make sure I wasn't losing my mind and sure enough: Manufacturer: Simplo + various battery details. Full capacity, etc...

It's been operating great as a backup laptop for a few weeks now on and off the battery. Until this morning...

I did a MacOS update just took this morning, the battery disappeared again. The OS updates must have some poison pill features that kills certain brands of battery.

I'm going to try various nvram resets and/or let it run out again hoping I can repeat the experiment.

Grrrr....

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@leifster - Sorry, just like a loose light bulb in a socket a slight bang can cause it to turn off on you. Here the Microcontroller has a problem so when you stress it a bit it fails. This could be as simple as a cold solder joint or something deeper inside. In no way is this related to the OS or any update.


So you’ll need a new battery still. The NaN error is telling us the data can’t be fetched from the microcontroller in the battery.

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