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2 Posts

05-29-2017

CN

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T470 power bridge wired battery discharging order, always internal battery first

2017-05-29, 2:31 AM

Hoping this problem will be noticed by more people, the original post on this issue came from:

https://forums.lenovo.com/t5/Linux-Discussion/T470-Linux-Power-Bridge-wrong-discharge-order/td-p/3652916

https://www.reddit.com/r/thinkpad/comments/63odjr/t470_battery_order_question_internal_discharges/

 

Brief description: same problem with OS including Win 10, Ubuntu 16.04, Gentoo etc. The internal battery always gets discharged first regardless its remaining power, which is generally harmless but seems not so good for the internal battery life.

 

With my own T470 machine, updated with the latest 1.29 BIOS, this problem remains. According to searching results online, this little bug came with early versions of X's and T' including T460.

 

PS: this issue had been successfully fixed with T460 via BIOS update 1.26, hoping it would be fixed with T470 sooner or later.

 

Best regards.

 

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6071 Posts

10-29-2009

NC

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Re: T470 power bridge wired battery discharging order, always internal battery first

2017-06-01, 17:57 PM

I see the same behavior here.  We will check it.

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5 Posts

04-28-2017

DE

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Re: T470 power bridge wired battery discharging order, always internal battery first

2017-06-19, 12:06 PM

Any news on this issue or ETA when it will eventually get fixed?

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6071 Posts

10-29-2009

NC

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Re: T470 power bridge wired battery discharging order, always internal battery first

2017-06-27, 14:17 PM

Sorry for my slow reply as it took me some time to research this issue.  What I found out is that T470 is using a new algorithm which checks the wear level of each battery and first discharges the battery which is worn the least.  This makes sure that the two batteries wear out evenly and maximizes the lifespan of both batteries.  This behavior is different than T460 and earlier systems which always discharge the removable battery first.

0 person found this solution to be helpful.

This helped me too

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5 Posts

04-28-2017

DE

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Re: T470 power bridge wired battery discharging order, always internal battery first

2017-06-27, 14:33 PM

Thanks for the reply. So will there be an option to override this algorithm or do we have to live with the current setting?

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6071 Posts

10-29-2009

NC

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Re: T470 power bridge wired battery discharging order, always internal battery first

2017-06-27, 15:15 PM

There is no plan to provide an option to override the behavior (e.g. manually specify which battery gets discharged first).

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1 Posts

07-26-2017

TH

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Re: T470 power bridge wired battery discharging order, always internal battery first

2017-07-26, 21:20 PM

a month later, have anyone could fix this yet?

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1 Posts

08-18-2017

NL

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Re: T470 power bridge wired battery discharging order, always internal battery first

2017-08-18, 21:15 PM

Can I return my laptop back to the shop then? That seriously affects my usage pattern and I can't use the device thins way.

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1992 Posts

05-01-2010

US

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Re: T470 power bridge wired battery discharging order, always internal battery first

2019-03-12, 22:55 PM





Microsoft MVP Consumer Security 2006-2016 / Windows Insider MVP 2016-Present
I am not employed by Microsoft or Lenovo.

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1 Posts

12-15-2019

CA

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Re: T470 power bridge wired battery discharging order, always internal battery first

2019-12-15, 22:40 PM

Why not?  Giving the customers what they want (via BIOS update or Vantage) insures they stay customers!

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