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89 Posts

11-04-2013

CA

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Re: T480 battery discharge problem: internal battery goes first at all times!

2018-12-13, 21:47 PM

The system chooses which battery to discharge based on the wear level of the battery. The battery with the lowest wear level will discharge first every time, regardless of the amount of discharge cycles. That is what we are told. I have checked this every now and then and so far it has been true.

 

You can determine the wear level of the battery by going to the lenovo vantage app >> hardware settings >> power then look at the details of each battery. Take the "Full charge capacity" then divide it by the "Design capacity". Whichever battery has the higher number (least wear) will discharge first. So for example my batteries right now:

  • Internal battery - 22.05 (full charge capacity) divided by 24.02 (design capacity) = 0.91798...
  • External battery - 23.65 divided by 24.05 = 0.9834

So based on the calculations above, my internal battery has a higher wear level because it only has 0.91 of its designed capacity while my external battery has 0.98. Therefore the external battery will discharge first, which is what is currently happening on my T480. The reason they do this is so that the batteries will wear evenly.

 

While I get the logic behind this, I and the vast majority would prefer that they have control over how their batteries wear over time, or to at least always prioritize the external battery, which simply makes the most sense especially when carrying spare battery packs. Customers have been voicing their opinion for years since they made this poor decision and we've pretty much been left high and dry with no sign of hope that they will even consider our request.

 

Macute I find it funny how support was willing to offer you a replacement laptop, showing that it is indeed a problem, or the support have no idea what they're talking about (probably the latter). I also went to support and they didn't seem to know how the battery discharge priority works. It's quite sad to see when a customer knows more about their machine than Lenovo's support does, showing the company has grown far too big and impersonal to have high quality support. As much as I love thinkpads, I'm feeling quite weary with how things are going with this company. As I've said before, this will be my last thinkpad if they never come around to addressing this concern.

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

12-13-2018

ES

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Re: T480 battery discharge problem: internal battery goes first at all times!

2018-12-13, 21:51 PM

Yeah, but if that's set in the registry, maybe we can fool the algorithm into thinking that the internal battery has more wear. But, well, I don't really have a clue.

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89 Posts

11-04-2013

CA

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Re: T480 battery discharge problem: internal battery goes first at all times!

2018-12-13, 21:58 PM

I looked at those registry settings on my T480. Assuming the setting we need is in there, it will still be quite difficult to figure out how we can change the settings to yield the result we're looking for. I also do understand that at least in times past, the discharge priority was controlled by the BIOS, so what we really need is a BIOS update from Lenovo. In the past this is exactly what they released for the T460 when the system incorrectly discharged the internal battery first: https://support.lenovo.com/ca/en/solutions/ht500841

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

12-13-2018

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Re: T480 battery discharge problem: internal battery goes first at all times!

2018-12-13, 22:09 PM

Sorry souldier, didn't really read the last part of your post. Yeah, It has surprised me quite a bit too. The tech I talked to actually had to ask his coworkers, which told him at first that the internal battery discharging first was the intended behaviour. When I explained him how that made no sense he offered me the replacement. So yes, indeed they are willing to help, and also yes, they didn't know how it works.

As per the battery algorithm being BIOS controlled, well, it's a shame. I guess we will have to wait for it, but as my first thinkpad it's a bit disappointing. They made all those things better than any other laptop I've had, like the keyboard, build quality, my WQHD screen is really good, the performance and tech service, but those little, easily fixable stuff like the discharge order and the battery treshold not working are pretty irritating TBH. Mainly because they make all that "power bridge" marketed feature outrigh false.

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21 Posts

11-05-2018

CA

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Re: T480 battery discharge problem: internal battery goes first at all times!

2018-12-21, 12:58 PM

Battery 1 on my new T480 used to discharge first (over 8 cycles) and now Battery 2 discharges first. I'm wondering if Battery 2 is going to alway discharge first, which would be what most (not to say all) customers would like and what make more sense (from the consumer point of view).

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89 Posts

11-04-2013

CA

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Re: T480 battery discharge problem: internal battery goes first at all times!

2018-12-21, 13:12 PM

It will go back and forth between the internal and external battery, depending on which battery has the least wear. Unfortunately this has not yet been changed.

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

11-05-2018

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Re: T480 battery discharge problem: internal battery goes first at all times!

2018-12-21, 13:21 PM

That's what I suspect.. .but, there is always some hope :)

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5 Posts

11-17-2018

US

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Re: T480 battery discharge problem: internal battery goes first at all times!

2018-12-29, 15:00 PM
I just got my T480 when I noticed this weirdness with the improper discharge order … I see that Lenovo has no intention to fix this issue … I suppose I should return my device while I can because this thing with the discharge order make no sense what so ever. I want to trash my hot swappable battery no matter what … period.
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Re: T480 battery discharge problem: internal battery goes first at all times!

2018-12-29, 16:17 PM

Well, Although I understand the logic behind this strange bahaviour, it is totally unacceptable to us! Thinkpad like T480 model are business laptop, right? Lenevo should leave the option of discharge order to the users. Since we bought this laptop, we should have the right to make decision for our devices, but not treat us like computer illiterate. To be frank, I choose T480 because of this Think Setup (BIOS) and its keyboard. I will definitely switch to other brand like Dell, HP, ASUS for my next laptop if these problems still exist

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89 Posts

11-04-2013

CA

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  • Message 60 of 108

Re: T480 battery discharge problem: internal battery goes first at all times!

2019-01-01, 16:30 PM

I was pretty much on the verge of returning my laptop. The only thing preventing me was that I didn't want to deal with the hassle of having to ship it back, possible restocking fees, etc. If I were you I'd probably go through the support chat on the main website and see if you can have the restocking fee's waived because of this poor design decision and your disatisfaction with the product.

 

As for me, if Lenovo never gets around to fixing this issue, this will be my last thinkpad.

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