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89 Posts

12-04-2008

Germany

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  • Message 11 of 183

Re: Battery Life Decrease In Windows 7

2009-10-26, 17:13 PM

Did you set the Windows power scheme to "Maximum battery life"? On my T400 this added ~1h runtime (Wattage now: 6-8w) over the Power Manager's "Power Source Optimized".

 

Greetz!

M.T.

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59 Posts

10-06-2008

Toronto

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  • Message 12 of 183

Re: Battery Life Decrease In Windows 7

2009-10-27, 14:05 PM

I found out what was running up the wattage.  There's a process called dwm.exe.  It constantly uses the CPU at anywhere from 1 to 10% at any given moment.  dwm is Desktop Windows Manager.  Turning it off greatest decreases the battery life, but no more shiny window previews :(  I guess I'll leave it as is for now.  Recently did a Battery Reset though.  Gave me back 15% of my battery life :) My 9-Cell is rated for 84Wh, was at 70Wh before reset, now it's back up to 81Wh.  After one year of constant use that's pretty darn good.  Over 120 charge cycles now :)

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68 Posts

11-27-2007

Morrisville, NC

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  • Message 13 of 183

Re: Battery Life Decrease In Windows 7

2009-10-27, 14:11 PM

Out of curiosity, are you perhaps running the 64 bit version?

 

The reason I ask is that I just installed the Intel Matrix Storage Manager 64 bit driver.  It immediately made my wattage usage jump 5 watts and my fan go crazy.

 

I immediately did a system restore and backed it out.

 

That may also be a cause of your issues.

-------
Matt Kohut
Lenovo Product Marketing
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59 Posts

10-06-2008

Toronto

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  • Message 14 of 183

Re: Battery Life Decrease In Windows 7

2009-10-27, 16:41 PM

Yeah I am running 64bit.  I'll try uninstalling Intel Matrix Storage and see if that changes anything too.  I'll let you know the results when I get home.

 

EDIT: Didn't really do anything.  No change in wattage :(

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25 Posts

11-01-2008

Arizona

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  • Message 15 of 183

Re: Battery Life Decrease In Windows 7

2009-10-29, 21:27 PM

I am having the same issue. I installed Windows 7 last night expecting an increase in battery life and what I gota was nearly a 50% decrease.  Im not so sure I can handle such a low battery life. It went from 4 hours to just over two per charge.

 

I have a W500 4058-CT0 running 64bit Windows 7 with just about everything turned off and display at two bars when on battery. Any help is appreciated. After getting this all installed I would hate to have to uninstall and waste my money.

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13 Posts

10-29-2009

Germany

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  • Message 16 of 183

Win 7 x64 vs. Vista x64 - battery lifetime

2009-10-30, 16:50 PM

Hi all,

I hope somebody can help me.

 

I made a clean install of Win 7 x64 on my T400 2765-54G (also used TVSU).

Now my battery lifetime is max. 2.5h, using Vista it was 4.5h.

Anyone else with that problem and a feasible solution?

 

Rgds

 

Lars

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205 Posts

12-04-2007

Hong Kong

490 Signins

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  • Message 17 of 183

Re: Win 7 x64 vs. Vista x64 - battery lifetime

2009-10-30, 17:39 PM

power plan set to max?

----------------------------
T400s - 2815RW1 + Win7 Ultimate :D
Don't pm me for help! That's what the forum is for. Also, Google's nicer than me. Ask him.
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13 Posts

10-29-2009

Germany

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  • Message 18 of 183

Re: Win 7 x64 vs. Vista x64 - battery lifetime

2009-10-30, 17:45 PM

no, power plan is set to optimized

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7 Posts

07-22-2009

West Virginia

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  • Location: West Virginia
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  • Message 19 of 183

Re: Win 7 x64 vs. Vista x64 - battery lifetime

2009-10-30, 19:18 PM

I'm having this exact same issue except I upgraded from vista business x64 to windows 7 professional x64.  I've lost an hour of battery life.

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25 Posts

11-01-2008

Arizona

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  • Message 20 of 183

Re: Battery Life Decrease In Windows 7

2009-10-31, 0:03 AM

For some reason when I turned unplugged the battery last night it showed approximately the same battery life as I used to get, but I only had the system on battery for a few minutes. Then this morning when I used it it was back at half the value that it used to be under vista.

 

Do you think there is a fix for this, or should I uninstall windows 7? I am really disappointed in this. Vista was so horrible and now Windows 7 is just as bad, if not worse...

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