1-2 steps, Windows key, type gpmc.msc and it will be the first result in the prog search. I think this assumes the index is enabled, but since we are here ...
I'm giving this a try, and I'm having trouble following step 4. Once I add the Group Policy Object Editor to the right side of the GUI, I can click on it and get a pop-up, but I can't seem to find the expansion option.
Are you still in the "Add and Remove Snap-Ins" dialog by any chance? If you click ok on that dialog after having added the snap-in, it should appear in the main mmc UI on the left hand side.
1) Launch mmc (Win+R, "mmc")
2) File -> Add/Remove Snap-In
3) Group Policy Object Editor -> Add -> Local Computer -> Ok
4) Expand Local Computer Policy -> Computer Configuration -> Administrative Templates -> Windows Components -> Search
5) Find "Prevent indexing when running on battery power to conserve energy"
6) Enable -> OK -> Close
If you're on Home Edition then make a new *.reg file with the following content:
And run it.