Re: A few questions...
I think you'll find that it actually doesn't increase battery life. Intel wrote a program for Linux called "Powertop" that helps you work out what programs and settings are causing battery drain, and in their testing they found that it's better to upscale the speed of the CPU whenever it's hard at work, and then downscale its speed again when done.
Originally Posted by Dreakon
The aim is to get the CPU to the deepest sleep state as quickly as possible. If your CPU is running at the slowest speed without scaling, then it works inefficiently for longer before being able to sleep again.
The CPU should actually be cooler with scaling on, assuming you're not doing long CPU intensive operations on it. And if you're doing long CPU intensive operations... then get a desktop, it'll be an order of magnitude faster.
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.