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Repair guides and disassembly information for the MacBook Pro 16'' released in November of 2019. Model A2141, EMC 3347.

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Bought a battery from you, installed it. It won't charge.

Battery installed fine. No issues. Started it up and it was at 50%. Never any lightning bolt. Tried multiple USB C ports and multiple outlets. They worked with my ipad. Now the battery is at 7% and continues to drop. No sign of it charging. Any suggestions?

Update (10/09/2022)

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Hopefully this link will work to the screenshot of the Coconut Battery diagnostic screen I posted.

Answer this question I have this problem too

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Hi @nealpender,

I would suggest starting with downloading CoconutBattery and TG Pro.
The first (Coconut) is dedicated to battery information, whilst the latter is for in-depth diagnosing of many components.
I have had on occasion a battery that needed calibration, and iFixit has a nice post on this.

I'd also send an email to and include any information they ask for.

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Did both of those but nothing showed as being a problem.


@nealpender I would fire off an email to support (email above) or call them Monday morning. 805-464-0573 (iFixit customer support) if you're located in the US, or +1 805-464-0573 if you're outside of the US.


@nealpender - Please post a snapshot of CoconutBattery so we can see things.


@nealpender If you read this guide, it details how to update your original question with new images, which makes for easier reading.

In your Coconut screenshot, it says that the power adapter is not connected? Do you have any way of testing the power adapter and the power chord(s)? Fex another USB-C powered MacBook or PC? That way we could rule out the power equipment as faulty.

If the power adapter and -chord tests OK, I would take out the new battery and install the old one and start the Mac. Check Coconut to see if it still says that power adapter is not connected.


I plugged the power adapter into my iPad. It started charging immediately.

Something else I remembered. Several months ago I spilled Powerade on the keyboard and immediately picked up the Mac and shook it out. It kept working and even before that spill, my battery would sometimes lose charge all the way and not start up again for awhile. But it would eventually. Then the spill happened and nothing changed really.

But I did notice when I was replacing the battery, a couple small areas of corrosion and some gummy residue from the Powerade. I cleaned the corrosion with isopropyl and Qtips, but since the battery replacement didn’t require taking the entire motherboard out, I didn’t turn it over to see if there is further corrosion.

After reading up more today, I’m thinking it could be that since that spill several months ago, the corrosion has built up enough to cause some sort of interruption in the charging circuits? Does that sound logical?

What would be a fix for corrosion?

Thanks for all the wisdom.


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A 2019 shouldn't need a new battery for several more years. So I would bet the same thing was happening to your old battery. If so, the issue is not with the battery but with the charging circuitry.

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