Turn off Location Services: Turn off location services completely, and you'll save a lot of power, not to mention some money if youre traveling internationally. Go to Settings > Location Services, and toggle the switch Off.
Use Auto-Brightness: The control for Auto-Brightness, which automatically adjusts your screen's brightness based on ambient light conditions, is located in Settings > Brightness & Wallpaper. Manually lowering a screen's brightness yourself can extend battery life, too.
Bonus tip: Don't let your device get too hot or too cold. Apple recommends keeping your unit at between 32 and 95 degrees Fahrenheit. So if youre traveling anywhere in extreme temperature conditions, consider insulating your iPad or iPhone from the ambient temperature. (For more battery-saving tips, see Apple's own battery guide.)
Save your MacBook's juice
A couple of setting changes can help you get more out of your laptop's battery too.
Take advantage of Power Nap: If you're using a MacBook Pro with Retina Display or a Mid 2011 or newer MacBook Airand if you're running OS X Mountain Liontake advantage of the new Power Nap feature. With Power Nap enabled, your MacBook will continue to perform certain functions even when its not in use. It will still receive messages and email, perform a Time Machine backup, download updates from the Mac App Store, and do many other tasks, but at a fraction of the energy use.
By default, Power Nap is enabled when you plug your device into a power adapter, and is turned off when you run your device on battery power. To alter this while you're traveling, go to System Preferences > Energy Saver > Battery, and check the box next to Enable Power Nap while on battery power. For optimal battery life, disconnect any USB, Thunderbolt, or FireWire devices that draw power.
Choose swift sleep: While you're in the Energy Saver pane, review some of the other options for preserving battery life. For instance, you can adjust the amount of inactive time before your computer and display go to sleep; the quicker each of them sleeps, the more battery power you save.
Dial down graphics: If youre running OS X Mountain Lion or Lion on a 15- or 17-inch MacBook Pro, pay a visit to the Energy Saver pane in System Preferences. There you'll find a checkbox for Automatic Graphics Switching, which you should check; otherwise, the Mac will always use the faster graphics processor, which expends more power.