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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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Newly installed battery not recognizing

I just followed the ifixit instructions to replace my battery with a new one. It will not boot when the power button is pressed. If I hook up a thunderbolt power cable it will boot and run very slowly. The battery icon shows an “X”. I have tried resetting both the SMC and the PRAM. I don’t if it actually reset them, but I have followed a few versions of instructions to do so. I will hook up a volt meter to the new battery tomorrow to see if it has a charge maybe. Pretty frustrated. If anyone has any ideas please let me know. Thanks!!!

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Volt meter is useless to confirm if the battery is good or not. I guess you cant get a reading on the + and - without the computer sending power. I can go through the process to put the original battery back in and see if it still works, but that's a lot of work for a test.

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This series is dependent on the BMU data flex cable, if it's not correctly seated or damaged the BMU logic can't see the battery. Check to make sure the ZIF connector latches are set and the cable was inserted properly before setting the latch. If you bent it back too far you can damage needing to replace it.

923-03932 - Apple BMU Flex Cable

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Thanks for the tip! Everything looks correct there. I just took the cable off and then reinstalled it. Unfortunately the issue persists. If all else fails i can buy a new cable and try that.

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@danielv75372 - I would start there

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