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Released in July 2018, the 15" MacBook Pro, model A1990, features a 15.4 inch LED-Backlight display with True Tone technology, TouchID, and up to 6 Core i9 Processor.

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After battery change, system becomes noticeably slower

I have a MacBook Pro A1990 (EMC 3215) and I replaced its battery with an iFixit MacBook Pro 15" Retina (Mid 2018–2019) Battery. I performed the calibration procedure correctly, but I’m experiencing an issue — when I disconnect the charger, the system becomes noticeably slower. I’ve already restored macOS and updated it to the latest version, but the problem persists. Could this be related to battery compatibility, or does it indicate a possible hardware issue with the MacBook itself?

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Have you tried running the onboard diagnostics? Use Apple Diagnostics to test your Mac Tell us the errors if you get any.

Also let's install this great battery/charger monitoring app CoconutBattery let's get a snapshot of the Apps main window one with the charger and a second when disconnected.

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No error on apple Diagnostic, and coconut , no error at all, everything is OK.

.....

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@johandimension - Can you post a screenshot of CoconutBattery main screen so we can see it.

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In my experience, this is by design. Apple has intentionally designed their systems to run slower if on battery power on a non-apple original battery. I've seen it many times. One of the very many anti-consumer, anti-repair designs Apple does.

If you still have your original battery and some soldering skills, you can remove the control board from the original battery and replace it onto the new battery. This board has the "identity" of being Apple original and trick the computer into simply accepting the new battery and working correctly.

I would not recommend this if you have little/no experience soldering. While the task of removing this board is fairly simple, as far as soldering work is concerned, any work on batteries is very high risk and shouldn't be attempted without a good amount of experience and good safety measures on standby. That being said, it's not a terribly difficult job if you're careful and know what you're doing.

You'll have to pull back the black stickers on the little logic board to find the solder points. I'm attaching a photo of the solder points. This Apple battery isn't the same exact one as yours, but the attachments are very similar (I just don't have the exact correct one on hand right now).

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I've replaced quite a few MacBook Pro batteries I have not seen anything from Apple to prevent 3rd party batteries, I have seen some questionable quality batteries being sold. But that's the quality of the supplier and sometimes there can be a defect so you need to make sure the seller has a good warranty.

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Johan E Parra E will be eternally grateful.
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