08-01-2013 02:56 PM
After poking around for a while, I finally figured out how to change the charge threshold on a ThinkPad computer without Power Manager GUI installed. This has been tested to work on my x220 tablet. Here is how:
- Install Power Management Driver (tested with v184.108.40.206)
- Install Lenovo Settings Dependency Package (v220.127.116.11). This package actually contains the necessary code to interface to the battery controller chip.
- Open the Start screen with the Windows button, then type regedit.exe. Right click on regedit.exe and run as administrator.
- Find the registry key [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Lenovo\PWRMGRV\Data].
- Now you should see 4 entries that are currently set to 0: ChargeStartControl, ChargeStartPercentage, ChargeStopControl, ChargeStopPercentage.
- The first 2 entries, ChargeStartControl and ChargeStartPercentage, change the starting charge threshold. Double click on each of them and change them both to your desire starting charge threshold. For example, if you want to start charging the battery only when the bettery level is below 40%, change both of these entries to 40. Also, make sure you have Decimal selected as the base unit.
- The second 2 entries, ChargeStopControl and ChargeStopPercentage, change the stopping threshold. Double click on each of them and change them both to your desire stop threshold. For example, if you want to stop charging the battery at 80%, change both of these entries to 80 (base in Decimal).
- Restart your computer. Somehow, the values in these registry keys get written into the battery controller after restarting the computer.
I seem to have this working properly on my new W530, but would like to find a way to change this without restart the machine. I've tried playing around with tons of .exe's but can't seem to figure out what actually causes the changes to be written to the battery controller.
I'll write a script to automate this if I can figure it out; any ideas?
08-26-2013 03:28 AM
I've got a lenovo T430u with a windows 8 pro update version from windows 7.
I follow the procedure but it doesn't work for my machine, I have modified the value on regedit but my lenovo Settings program still shows that the battery will begin to charge at 46% ans stop at 50 % , I have checked "Always charge the battery completly"
I was asking if someone know how to find the parameters "46" and "50" in the register database ?
Thank you to help
03-04-2014 01:17 AM
The trick seems to work on Helix, but only for the tablet battery, not the dock battery.
I tweak some numbers under two different keys under
I believe one of the two keys is for the tablet battery, and the other for the dock battery. I set them to same values. In the Metro App of Power Management, I do see correct indications, such as, Charge to 85% for both batteries. But the dock battery is alway fully charged.
04-24-2014 03:53 AM
Thanks wsko for the tip. It works on my T440p and I have some observations.
Here's my settings
"ChargeStartControl" appears to control enable/disable of the start charging function so you only need to enter 0 or 1. 0 = disable, 1 = enable.
"ChargeStopControl" similarly this enable/disable stop charging function. Again 0 = disable, 1 = enable.
Only in these 2 keys you set the percentage in decimal.
Also about the location of the registry key:
I am running Windows 8.1 64bit, key location as follow
The "Wow6432Node" indicates this software is running in the 32bit subsystem on 64bit Windows. So I think on 32bit Windows, it should look like this
07-14-2014 10:48 PM - edited 07-14-2014 10:56 PM
I tried this on my T440s. Because I'm working on my desk most of the time, I removed the rear battery and I only use the intergated battery.
I tried this and set it to start charge at 40% and stop at 50%. It seems to stop charging at 50% alright, but the charge never drops below 50% as long as the AC cable is plugged in.
If I understand this correctly, shouldn't it be allowed to go all the way to 40% before it starts charging? Anyone got this to work on T440s?
07-17-2014 09:18 AM
This is an update.
Lenovo has released Power Manager for Windows 7 for Think laptops on July 4, 2014: guu403ww.exe (http://support.lenovo.com/en_US/downloads/detail.page?LegacyDocID=MIGR-70601)
I believe Lenovo will release a version for Windows 8. But I can't find it now no the website.
I am running Windows 8.1 on T430 and figured how to install the Win 7 program on my operation system thanks to an article I read (it's written in Chinese so I'm not posting the link here).
It's fairly easy. Just install guu403ww.exe under "compatability mode". Right click on the installer, then left click "shoot compatability", then "troubleshoot program", after that select "the program worked in an earlier version of windows", then select "windows 7". Follow the remaining steps and it will allow you to install Power Manager on your Windows 8.1 system.
After restarting your computer, the traditional "Power Manager" is back on your windows 8. Click on the green battery icon to start the program. Under "Battery" tab, and then "battery maintainance", you may customarize your charge threshholds, including "start charging when below ()", and "stop charging at ()". I tested the program and it works fine on my system. It's pretty neat. I set the threshholds for my T430 as 50% and 80%.
Good luck to all of you. Thanks also to all the posts above which gave me a clue how important battery maintainance is.
07-22-2014 06:44 PM - edited 07-22-2014 06:45 PM
And an update after installing Power Manager on Windows 8.1/T440s in compatibility mode: it worked fine for a couple of days, but then I noticed File Explorer became unresponsive and frequently hangs/restarts. You have the same problem if you notice the taskbar occasionally disappearing when you engage File Explorer. I disabled everything and tried to get to the bottom of this and only after uninstalling Power Manager did the system go back to being stable.
I can't be certain this is completely due to Power Manager, but thought I'd share my experience.
07-23-2014 05:54 AM
I am running the win 7 version of Power Manager on my T430 Win 8.1 laptop. It runs fine and I've never encountered the problem you described. It seems a compatability issue on your end though I don't know what it is. By the way, I also installed Lenovo Dependency Package.