Clamshell mode makes battery swell

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Level 1

8 points

Clamshell mode makes battery swell

I usually use the UltraFine 22" & 27" monitor as my primary display for the MacBook Pro 15" (2016) at home and work.

Yesterday, I found my MacBook's battery had been swollen, cause I noticed the palm rest was dangle in a flat table.

The Apple service center said it's just passed 1 month for warranty service (3 years) because the limited date was about early March. (writing today: 29/Apr. 2020)

And my service engineer said the clamshell mode would make overcharging the battery. But the clamshell mode is Apple's official function to use the external monitor, so I can't understand why there is no appropriate option (software in OS level) for protecting the MacBook from overcharging.

Is this right charging me for this fix? Is it my fault?

Thanks

MacBook

Posted on Apr 28, 2020 8:36 PM

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Answer 1

sj.lee Author

Level 1

8 points

Apr 28, 2020 9:46 PM in response to Kappy

That's right, but I'd say it doesn't seem to be a fundamental solution to me.

And, I know most modern electric devices have the circuit for prevent overcharging built-in.

Did you check the function about optimized battery charging on iPhone with iOS13?

https://support.apple.com/en-us/HT210512

The reason this feature was developed is that a fully charged state is not that very good (ideal) for many devices with built-in batteries.

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Answer 2

Kappy

Level 10

361,843 points

Apr 28, 2020 8:45 PM in response to sj.lee

The problem is a defective battery. Stop using the computer and disconnect the charger until the battery has been replaced. A swelling battery is a potential fire or explosion risk.

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Answer 3

sj.lee Author

Level 1

8 points

Apr 28, 2020 8:48 PM in response to Kappy

Yes, you right. But the charging is necessarily with the thunderbolt cable to use the external monitor.

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Answer 4

Kappy

Level 10

361,843 points

Apr 28, 2020 9:04 PM in response to sj.lee

If you stop using the computer, then you do not need the AC charger or the external monitor connected.

The battery firmware prevents overcharging. Your monitor does not charge the battery.

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Answer 5

Apr 29, 2020 7:10 AM in response to sj.lee

Clamshell mode does not cause the battery to overcharge. You have a defective battery. Stop using the computer and get the battery serviced.

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Clamshell mode makes battery swell

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