TLP brings you the benefits of advanced power management for Linux without the need to understand every technical detail. TLP comes with a default configuration already optimized for battery life, so you may just install and forget it. Nevertheless TLP is highly customizable to fulfil your specific requirements.
There's links to configuration and a FAQ on its home page, but you might see an improvement just by installing it. It's a set of scripts, so there's no GUI and it won't appear in the menu.