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2 Posts

12-28-2017

US

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T25 battery discharge order

2017-12-28, 9:21 AM

Hi, I'm a T25 user. I've seen several posts about the new discharge behaviour on thinkpads (i.e. to discharge the battery with least wear first) however, like many other users I would like to discharge the external battery first, since I purchased the 72Whr battery for this purpose. In another post, it was suggested that this behavior might be fixed soon - any updates?

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574 Posts

03-20-2011

CA

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Re: T25 battery discharge order

2017-12-29, 3:45 AM

I believe like all of the Thinkpads with the dual battery design (Internal + External), the External battery drains first, then the internal, to facilitate the hot swapping of the external battery while the system is running on the internal battery.

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| X220 i7-2620M | 12.5" HD IPS | Intel 180GB SSD | Crucial 480GB mSATA SSD | 8GB DDR3 | Intel 7260 AC |
| X260 i7-6600U | 12.5" FHD IPS | Samsung 860Pro 512GB SSD | 16GB DDR4 | Intel 8260 AC |
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56 Posts

11-24-2007

Israel

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Re: T25 battery discharge order

2017-12-29, 8:35 AM

wrote:

I believe like all of the Thinkpads with the dual battery design (Internal + External), the External battery drains first, then the internal, to facilitate the hot swapping of the external battery while the system is running on the internal battery.


It appears that this used to be true, but not anymore; the new algorithm changes the discharge order dynamically, based on battery wear.

https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/Battery-issues-about-my-t470/td-p/3825442

 

FWIW, I prefer the old algorithm myself, and would like it if there was some way for the user to control it.

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89 Posts

11-04-2013

CA

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Re: T25 battery discharge order

2018-09-12, 22:04 PM

This issue still persists and it is September 2018. I wish Lenovo would listen to the feedback of its customers and bring back the old discharge order where the external battery always discharges first. Or at least give the user the option to control this behavior.

ThinkPad T480 | i7-8650u | 32GB | MX150 | WQHD | 72wh
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