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09-14-2019

US

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ThinkPad P52 20M9 frequently shuts off when plugged in without battery, running on Airplane Mode

2019-09-14, 22:55 PM

I just purchased a ThinkPad P52 20M9 with an Intel 660p 1GB SSD running. 

 

Since I use mostly when AC is plugged in, I wanted to save the battery by detaching it. My AC outlet is a normal home outlet that supports at least 1000Watts. Also I turned on Airplane Mode to just have a taste. And then all starts to behave weird:

 

When I removed the battery, the P52 boots and windows could be logged in. However it only lasts seconds and then shuts off. 

 

When I turn off the Airplane Mode, turning on without battery would behave well - nothing wrong would happen. However, turning on Airplane Mode in Lenovo Vintage without a battery would 100% shut off the computer immediately. 

 

What is wrong with this? Isn't it supposed to run perfectly without battery attached?

 

Please help.

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2031 Posts

07-22-2010

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Re: ThinkPad P52 20M9 frequently shuts off when plugged in without battery, running on Airplane Mode

2019-09-14, 23:49 PM

Welcome to the forum.

 

See below post about airplane ,mode.  I know you have a P52 but airplane mode still applies.

 

https://forums.lenovo.com/t5/ThinkPad-P-and-W-Series-Mobile/P70-Airplane-mode-shuts-off-AC-adapter/ta-p/3383806

 


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11291 Posts

01-02-2010

US

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Re: ThinkPad P52 20M9 frequently shuts off when plugged in without battery, running on Airplane Mode

2019-09-15, 0:22 AM

You need more watts than what is put out by an airplane source.  In any case, I have always believed that any machine runs at a somewhat slower speed when there is no battery inserted,  A modern laptop will not keep charging after the battery is charged,  Thresholds can also be set in Lenovo Vantage.


Rich


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413 Posts

07-08-2019

CA

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Re: ThinkPad P52 20M9 frequently shuts off when plugged in without battery, running on Airplane Mode

2019-09-16, 5:53 AM

To add to richk's answer :

 

Set the battery thresholds to Charge below 40% but not higher than 50%. Those thresholds where recommended by a Lenovo employee on this forum for people always plugged in.

 

The battery will be there to stabilize the power system but not continually charged. The battery icon will indicate "Plugged in, not charging".

 

Martin

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