A notebook should sustain battery life for as long as possible when on the move. Internal devices such as WLAN- adapter or modem often remain unused and use up a lot of power unnecessarily.

The components that are not needed can be deactivated and
reactivated using the Device Manager, but the process is complicated. A suitable alternative is the free command line tool ‘Devcon’ from Microsoft.
When you pack
the required commands in a batch ile, a double-click is enough to switch on and switch off the superluous devices.

Download the tool from ‘http://download.microsoft.com/download/1/1/f/11f7dd10-272d-4cd2-896f-9ce67f3e0240/devcon.exe’.

Start ‘devcon.exe’ and move both program versions into an empty folder. Now, copy the 32-Bit variant from the sub-folder ‘I386’ in the Windows folder. If you have logged in as an Administrator, you can

use ‘devcon’ directly from the command line. You can obtain information regarding the tool using the command ‘Devcon
help’. Detailed instructions for individual commands can be obtained, if you use additional commands such as ‘Devcon help enable’. Before you use the available commands, determine the most cryptic
identification of the device concerned. For that, use the command ‘devcon ind * > C:\devices.txt’. The tool creates a devices.txt text file with an overview of all the available devices and their identifications. For further access to the devices, you will require these unique, cryptic names.  The example given here is the name of an ISDN-Card—PCI\V EN_1244&DEV_0E00&SUBSYS_0E0 01244&REV_2\4&1A671D0C&0&10F 0.

If the beginning of the identification is clear, you can replace the rest by ‘*’ as wildcard. With the command ‘devcon disable PCI\VEN_1244&DEV_0E00*’, you can deactivate the ISDN adapter that is no longer required.

You can reactivate it with ‘devcon enable PCI\ VEN_1244&DEV_0E00*’.
Since you would hardly want to enter such commands in the command line,
create one batch file each for activating and deactivating a device. Start the
text editor and enter the command to deactivate the device. Preferably, use the entire identification, so that the command remains unique even if you install similar devices later. Save the file as ‘isdn-stop.
bat’ in the Windows folder.

Then create another file with the devcon command
to activate the device and save this one as ‘isdn-start.bat’. Drag both files to
the desktop and create shortcuts. After completing this procedure, you can
manage this switching comfortably with just a double click.
Attention: Never deactivate devices about which you do not have complete
information. You could be deactivating important components of the system and
that might hamper the functioning of the Windows operating system.