Okay. For the sake of getting things clear, I'm gonna write this quick example. What we're gonna do is an ultra battery saver setup.

1. Open CPUTweak, then choose "Profiles"
2. Select "Life Doubler" and tap OK when prompted to make it default
Life Doubler is going to be the profile we want to load when the device is active. Note: A file called reg is now created in /usr/share/kernel-power-settings which is actually the Life Doubler profile. (This is the case with all other built-in profiles.)
3. Now tap on "Build My Own"
We're going to build an underclocked + undervolted profile
4. Choose 250 then 28 then 180
5. Choose 500 then 29 then 360
6. Done. Now hit the "Proceed" option
We have now created an ultra low profile, let's go to the extras options. We're gonna leave "Up Threshold and Sampling Rate" as is, because we won't need to manipulate them.
7. So enable SR
8. Then tap on "Configure Powersave Bias" and set it at 200
9. Finally, tap on "Enable Ignore Nice Load" and tap on OK
Success! You can view the profile if you want to compare what you've done with what's written here. Tap OK to return back now to the original window. Note: A file called userbuilt is now created in /usr/share/kernel-power-settings/ which is the profile we've just created.

Now let's activate the patch that shall make use of these settings!
1. Tap on "Configure Patches" then choose the Express option
We are going to set the profile now to load when active
2. Remember Life Doubler? Yes, navigate to /usr/share/kernel-power-settings (which appears as ker because the window is small)
3. Between the files you should find "reg" which is Life Doubler, tap it.
4. Now you're gonna set the profile to load when idle, so repeat the upper steps but choose "userbuilt" which is approximately 2 files under "reg"
5. Wait for 2 secs, then voila!
6. Now tap "Reboot"
Once your device restarts, just lock/unlock it once and there ya go, enjoy battery juice.