Mid 2015 MBP shutdown at 40% after new battery

Question

MacBook Pro 15" Retina Display Mid 2015

2.2 GHz (Turbo Boost up to 3.4 GHz), 2.5 GHz (Turbo Boost up to 3.7 GHz), or 2.8 GHz (Turbo Boost up to 4.0 GHz) quad-core Intel Core i7 processor with 6 MB shared L3 cache and an optional AMD Radeon R9 M370X dGPU.

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vintageb3 @vintageb3

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crwdns2931729:0crwdne2931729:0: Ndz 28, 2024

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Mid 2015 MBP shutdown at 40% after new battery

Hi Folks. I just replaced the battery in my mid 2015 MBP from a battery bought from Amazon. The installation went well, and the battery charges to 100%. I have reset SMC and NVRAM and booted to safe boot numerous times and the battery still cuts off at 40%. I've also tried using Terminal : sudo nvram -c. Then password. I just get an error message back:"nvram: Error clearing firmware variable fmm-computer-name: (iokit/common) not permitted" I used Apple hardware check & Techtool Pro and the battery comes back with no errors. I assume its a battery calibration issue. Anything else I could try? Would disconnecting the battery and waiting a while help? Hope someone can help! Thanks in advance!

Hope this helps Dan?

Thanks!

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I have edited the model to match your description > MacBook Pro 15" Retina Display Mid 2015 hope it is right.

crwdns2934271:0Ndz 28, 2024crwdnd2934271:0 livfe crwdne2934271:0

Please install this App CoconutBattery, take a snapshot of the main window and post it here. Something doesn’t sound right.

crwdns2934271:0Ndz 28, 2024crwdnd2934271:0 Dan crwdne2934271:0

Thanks to Livfe and Dan!

crwdns2934271:0Ndz 28, 2024crwdnd2934271:0 vintageb3 crwdne2934271:0

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I have edited the model to match your description > MacBook Pro 15" Retina Display Mid 2015 hope it is right. — livfe
Please install this App CoconutBattery, take a snapshot of the main window and post it here. Something doesn’t sound right. — Dan

score 1 · Answer 1 · 2024-09-29T00:26:16-07:00

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livfe @livfe

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crwdns2931729:0crwdne2931729:0: Ndz 29, 2024

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IF I remember rightly I had a similar issue on a MB Air recently and it was something to do with some components from the battery to a going faulty SMC chip. The MB Air would shut down at 80% but didn't show a connected battery in the menu bar...... I think it was this post Battery Power OK But Battery Not Dectected...... It might be worth trying a total fresh clean install to see if the problem persists.

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A clean install was on my mind also. Thanks for the advice. I leave for work in the US soon and not sure if I want to go through a clean install at this point. It makes sense though. Thanks!

crwdns2934271:0Ndz 29, 2024crwdnd2934271:0 vintageb3 crwdne2934271:0

@vintageb3 A time machine backup would put everything back 'as it was' just in case, You could download this small app called mist from github https://github.com/ninxsoft/Mist this will get and even make for you a Monterey latest version installer. When you have the energy and time try it, if it cured the problem then great, if not then there maybe a deeper issue that may require some specialist brains. I am also using a 2015 2.8 (DG) 15" MBP, awesome machine! BTW could also boot externally just to see if there was any positive results! Good luck!

crwdns2934271:0Ndz 29, 2024crwdnd2934271:0 livfe crwdne2934271:0

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