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Tanckom
Punch Card
Posts: 39
Registered: ‎04-17-2017
Location: LU
Views: 1,737
Message 1 of 9

T470P 5h battery, even on Power saver with the big battery and no heavy programms

So, I had opened months ago a thread here about the short battery time with the T470P. I got my hands on the biggest available battery (72Wh), but still manage, even after a gauge reset, to get around 5h battery time, only using Firefox, and minimal Words/PDF. All on POWER saving mode. What's going wrong with the T470P that it wont even reach half of its promised 12h battery time? (I know those are Airplane mode numbers, but 5h is a joke compared to those)

MatthiasP
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Posts: 8
Registered: ‎09-03-2017
Location: DE
Views: 1,726
Message 2 of 9

Re: T470P 5h battery, even on Power saver with the big battery and no heavy programms

I have the same experience with a P40. Have you checked, if there are some unnecessary processes running in the background? Maybe you can deactivate them. Otherwise you have to hope for better drivers...

Tanckom
Punch Card
Posts: 39
Registered: ‎04-17-2017
Location: LU
Views: 1,710
Message 3 of 9

Re: T470P 5h battery, even on Power saver with the big battery and no heavy programms

I have Samsung Magician, Greenshot, Panda Antivirus, OpenVpnGui, Geforce 940MX GUI (which i additionally downloaded from Nvidia) running. They doesn't sound like heavy load programs.

About the 940MX, it only displays if the 940MX is used or not.

pjc123
802.11n
Posts: 191
Registered: ‎07-31-2013
Location: US
Views: 1,701
Message 4 of 9

Re: T470P 5h battery, even on Power saver with the big battery and no heavy programms

As was mentioned, check task manager. I can tell you that on my cellphone, the VPN uses a very large amount of CPU time to do encryption calculations, and drains the battery very quickly.

Tanckom
Punch Card
Posts: 39
Registered: ‎04-17-2017
Location: LU
Views: 1,689
Message 5 of 9

Re: T470P 5h battery, even on Power saver with the big battery and no heavy programms

1.png2.png3.png

 

VPN is not at all activated - the VPN Gui is opened.
From the screenshot here, I cant see anything that overloads the battery.

pjc123
802.11n
Posts: 191
Registered: ‎07-31-2013
Location: US
Views: 1,679
Message 6 of 9

Re: T470P 5h battery, even on Power saver with the big battery and no heavy programms

I didn't know that you only have the OpenVPN GUI loaded but you are not connected to a VPN server.  You never actually use it?

Tanckom
Punch Card
Posts: 39
Registered: ‎04-17-2017
Location: LU
Views: 1,675
Message 7 of 9

Re: T470P 5h battery, even on Power saver with the big battery and no heavy programms

Very few times (once  a month maybe)

ebec
Fanfold Paper
Posts: 6
Registered: ‎06-12-2017
Location: NO
Views: 1,628
Message 8 of 9

Re: T470P 5h battery, even on Power saver with the big battery and no heavy programms

The T470P has a problem with power management. I have found that the CPU "loose" or stops using the CPU Package c-states after running for a while, could be from a few minutes to a couple of hours (the core C states are fine). When it stops using the package C-states they will not be active again until reboot, sleep or timeout from "Turn off display  XX minutes". It does not help to close all programs and just let it idle with CPU usage 0-1%

 

You can verify this by download HWInfo(64). Run the sensors-only and look for "CPU Package C Residency" you should see C2 to C9 on battery and C2 to C6 in docking. When the Package C states disappear, it is also reflected on indicated runtime. When on battery the idle "CPU Package Power" increase from about 0.4Watt to about 2.5W.

I have also set up dual boot to troubleshoot this with a clean installation of W10 creators update with the same result. Same problem with all BIOS versions since new in April.

 

i7-7700HQ
512 GB M.2 PCIe NVMe
14" WQHD IPS panel
8GB DDR4 2400MHz
NVIDIA GeForce 940MX 2GB GDRR5
Battery 6 cell Li-Ion (72Wh)

 

 

 

Lenovo should look at this problem!!

RansOupZI
Paper Tape
Posts: 1
Registered: ‎10-24-2017
Location: SG
Views: 1,473
Message 9 of 9

Re: T470P 5h battery, even on Power saver with the big battery and no heavy programms

Hi All,

 

I also faced the same issues as well.  Battery performance dropped significantly even at idle.

 

I logged a case with my local Lenovo support and for a few months they are unable to find the issue. They changed the laptop motherboard multiple times and the issue still persist.

 

All drivers are installed up to date. BIOS also installed the latest version. Verify from Lenovo Companion no new drivers available. Just update to Window 10 version 1709, Redstone 3 as well but still no improvements.

 

Following configurations on my T470p:

i7-7820HQ
512 GB M.2 PCIe NVMe
14" WQHD IPS panel
16GB DDR4 2400MHz
NVIDIA GeForce 940MX 2GB GDRR5
Battery 6 cell Li-Ion (72Wh)

 

In fact I have been seeing there are a few other forum opened by other users.

https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/New-T470p-Battery-wont-last-an-hour/td-p...
https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/T470p-battery-life/td-p/3744629

https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/T470p-issues-with-battery/td-p/3674015

https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/T470p-battery-life/m-p/3744629

https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/T470P-Brand-new-battery-dropping-below-5...

 

It seems as though Lenovo is not taking this issue seriously and till today there are no resolution to this. 

 

Regards,

Oliver

 

=======================================================================

Update:

Added a screenshot from my Lenovo settings previosuly with 6 cell 72wh.

Capture.JPG

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