STEP FIVE (Another Battery-Saving Strategy)

There's another little thing you can do make your battery last longer. In the Energy Saver options under the System Preference (where you set the time for when your PowerBook/iBook goes to sleep), there's a checkbox you should turn on. It's named "Put the hard disk(s) to sleep when possible." Ensure this is selected for another way of saving battery life so you can work without power interruptions.