2018 MacBook Pro refused to boot up after being left overnight NOT connected to charger.

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2018 MacBook Pro refused to boot up after being left overnight NOT connected to charger.

So my 2018 macbook pro was left without being connected to the charger overnight a few days back and in the morning it refused to boot up. I'd tried everything (even disconnecting the battery inside) and it just wasn't having it. I even held the power button on for 2 minutes.

Just now I took the back case off AGAIN and probed around with a multimeter and it was giving some reading (3.5 volts at most. I even disconnected the battery and reconnected it.

Put it back together and plugged it it and pressed on the track pad and noticed it was clicking, which was odd, given that it gave no signs of life for 3 days now.

Then it started to boot up and I'd logged it to find that the battery was completely discharged and at 1%.

How is this possible? Anyway to stop the battery being drained when he macbook is closed-lid?

Anyone had a similar issue? I love my macbook (it's like my 'extra limb') and would hate for something like this to happen again, repeatedly.

Appreciate any help.

MacBook Pro 13″

Posted on Aug 8, 2024 5:33 AM

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Answer 1

Top-ranking reply

Grant Bennet-Alder

Level 10

145,313 points

Aug 8, 2024 10:40 AM in response to jovicafromsydney

That blocky device that plugs into the wall is the POWER ADAPTER. I am not trying to be a jerk about terminology, what these boxes do and how they do it is essential for understanding how they all work together.

The CHARGER is inside the MacBook Pro, and is completely under program control. Your Mac accepts some power when needs to run, and accepts more power when intends to charge its internal battery. A power source like the Power Adapter can not 'force itself' on your MacBook Pro. Only the algorithms inside your Mac can decide when is a good time to charge the battery.

On a MacBook Pro 2019 Intel system, the System Management Controller (SMC) runs stuff like fan speeds, clock rates, sleeping, waking, and charging. if it gets confused, an SMC reset is supposed to set it straight.

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many users are running into situations where they closed the lid, did NOT connect a power source, and found their Mac DEAD in the morning. Closing the lid is a REQUEST to go into sleep mode. There are MANY reasons why it may not actually enter sleep mode.

You should ALWAYS connect your MacBook Pro to a power source when one is nearby, and only run on battery power alone, which may be somewhat slower and less responsive, when absolutely necessary. Your Mac is not an iPhone, and was never intended to be run all day every day on battery alone. Your Mac will NEVER overcharge.

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2018 MacBook Pro refused to boot up after being left overnight NOT connected to charger.

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