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Model A2159, EMC 3301. A refresh of the entry-level 13" MacBook Pro. Available in Silver and Space Gray. Released July 2019.

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Computer only turns on when plugged in after battery disconnect

Greetings, I don't know if this is standard or an issue with my computer, but whenever I disconnect the battery power connector (I did this when replacing the battery, replacing the speakers, replacing the USB-C Connectors), after I reassemble, reconnect the battery power connecter and the ZIF connector for the battery data cable, it won't turn on. I know I had autoboot shut down, I used terminal and put in the AutoBoot=%00, so it won't turn on automatically. However, when i press the power button, hold it down, etcetera, nothing happens. It will only turn on the first time when I connect the power brick to the computer. Then it will turn on, no problem, and after that initial turn on, when I reset the auto boot, it turns on as it should, or if I physically touch the button. Is this normal or do I have an issue with my machine?

For the diagnostics: My computer was at 85% battery capacity. The battery condition is 'Normal' and when working, the computer is on a silicone work mat, and I am tethered to a ground strap going to the ground system in my house. All of my screw drivers and tools have been demagnitized and I check before using them.

Thanks for your help, everyone!

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What happens when you use the original battery? That is as long as it’s not badly damaged from taking it out.

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The original battery was replaced because it no longer was able to hold any charge. I couldn’t use it at all unless plugged in. So I don’t know. I have had this happen with two computers, same generation. Still stumped as to the why.

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@roosh - The power control logic has been known to fail in this series. You’ll need to service the logic board are you up to the task? This might be best to let someone else fix. Where do you live? Country and nearest city, maybe we can aim you to someone nearby.

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I live in the USA. Currently in Philadelphia. I am sure there is someone here who is qualified to do so. I am still quite new to microsoldering. I hot swapped a USB-C connector on a 2016 MBP, but that was with a heat gun and a piece of aluminum as a heat shield.

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@roosh - Give MackTechs a try.

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Here are some solutions that you can try :

  • Check the BIOS/EFI Settings: After reassembling the laptop, make sure the BIOS settings, especially power-related ones, are configured correctly. You could also reset the BIOS to its default settings and then re-enable the autoboot feature if needed.
  • Battery Calibration: Run a battery calibration process. This can help the system correctly recognize the battery after any internal changes.
  • Firmware Update: Ensure that your laptop's BIOS/firmware is up to date, as updates often contain fixes for power management issues.
  • Check Battery Connections: Double-check all battery and ZIF connections to ensure they are secure. Loose or slightly misaligned connections could result in issues like this.

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Thank you for this. I checked the ZIF connector when I reattached the battery. And when it didn’t turn on, I opened it, removed the connector, reattached the battery, and reattached the ZIF. Then after five minutes, I plugged it in and got the battery level and then it turned on. I will check the BIOS. I had installed some home brew before, and possibly it, or myself in my idiocy (I am much better with hardware than software), mucked about with the settings. I just need to recall the password I set.

I did calibrate the battery when I installed it, and I use coconut battery to monitor it. Thank you for the advice.

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Do Mac laptops have a BIOS and Firmware to update?

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@livfe - BIOS is an antiquated term as it was part of the original IBM PC as a ROM chip which offered the basic IPL process and a few other tools. Later newer systems offered EEROMs which could be updated without needing to replace the chip, hence firmware was born.


Today PC’s follow a different path as well as Mac’s: Unified Extensible Firmware Interface (UEFI). It allows more customization and better security.


Apple structures their firmware in different structures than what Windows Intel PCs use. In any case Apple often applies updates to their UEFI within its OS updates.

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@danj My comments are being removed? Are you doing this?

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@livfe - Post you concerns in Meta, don’t pollute someone’s question with other stuff.

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