Folks over Macworld have posted a few things you can do to extend battery life and conserve power. Very simple steps. Take a look:
Invest in a battery case
A battery case for your iPhone extends the phone's battery life and keeps it safe from occasional drops and bumps. Most battery cases come with dock-connector plugs designed to pair up with the iPhone’s 30-pin (iPhone 4S and older) or Lightning (iPhone 5) connector port, which they use to deliver the juice to your iPhone. The only downside is that you can't use any dock-cradle accessories without removing the iPhone from the case.
Mophie's Juice Pack Plus for the iPhone 4/4S.
One of our favorite battery charging cases is the Mophie Juice Pack Plus for the iPhone 4/4S ($100). It almost doubles your iPhone’s battery life without add too much weight, and you can still sync your iPhone using the included USB-to-Micro-USB cable. The Juice Pack Plus also has an on/off switch, so you can control when the case sends electricity to your phone.
Although the company promises one soon, Mophie has yet to release a battery case for the iPhone 5. uNu’s Ecopack for the iPhone 5 ($80), however, is a good option to use now with the latest iPhone. This battery case snaps onto your iPhone and doubles its battery life. The Ecopack comes in a variety of colors, and it purports to be eco-friendly because you can swap the battery portion of the device between cases, enabling the battery to last through several phone upgrades.
Padacs makes Enduro battery cases for various full-size iPads and for the iPad mini.
You can also pick up an external battery case for your iPad, which is a great travel accessory if you plan to watch videos during airplane flights. The Padacs Enduro is a folio-style polyurethane case with a built-in lithium-ion battery pack. This slim battery provides 8000mAh to boost the iPad’s battery life when it gets low. Just plug the included adapter cable into your iPad’s dock-connector port and press the On button when you need more juice. The Enduro is available in different models for the iPad mini ($60), the fourth-generation iPad ($60), and both the third-generation iPad and the iPad 2 ($60). Enduro says that, if you have the proper adapter, its cases can also charge your iPhone or iPod, though we haven't tested this feature.
Pack a single charger
On trips, use your iPad's power adapter to charge both your iPad and your iPhone.
It isn't necessary to bring both the charger that came with your iPhone and the one that cam with your iPad. Save space by packing just the one that came with your iPad. Visually, the iPad charger is bigger, with prongs that can be pushed in and pulled out of the square body, similar to a MacBook charger; the iPhone charger is smaller, and its prongs can't retract.
But what if you have an iPhone 5 (with a Lightning connector) and, say, a third-generation iPad (with the older 30-pin dock connector)? You can still pack just the iPad’s larger wall charger unit and bring both your Lightning-to USB-cable and your 30-pin-dock-connector-to-USB cable, or pack a Lightning-to-30-pin adapter if you have one.
The Twelve South PlugBug can charge your iPad and MacBook through one power outlet.
iPad and iPhone wall chargers supply different levels of power. The iPad's greater charging requirements demand the heftier power adapter—a 10- or 12-watt USB power adapter depending on your iPad, compared to the iPhone and iPad mini’s USB power adapter, which has an output of 5 watts. You can use the iPhone’s adapter for your iPad, but the device will take significantly longer to reach a full charge, especially if it's a third- or fourth-generation iPad.
If you travel with a MacBook as well, you might want to get the Twelve South PlugBug ($35). It attaches to your MacBook’s power brick and allows you to charge a USB device (such as your iPhone or iPad) and your laptop at the same time.
Tweak iPhone and iPad settings
Conserving your battery's charge can be as simple as tweaking some settings on your iPhone and iPad.
You can save a lot of power by tweaking the settings on your iOS device. (You don't have to tweak all of the settings at once, though.)
Turn off wireless options: Turn off Wi-Fi when you’re not using it. Go to Settings > Wi-Fi, and then toggle the switch to Off. The same goes for Bluetooth: Turn it off if you’re not using it. In this case, go to Settings > General > Bluetooth, and toggle the switch to Off.
Turn off notifications: Turning off or limiting your data push-notifications from your other apps is worthwhile, but you’ll have to do it manually for each app. Go to Settings > Notifications, tap each app that you’d like to adjust, and toggle the Notification Center switch to Off.
Turn on Airplane Mode: Turning on Airplane Mode disables all of your device's wireless features—cellular data, Wi-Fi, Bluetooth, GPS, and other location services. Go to Settings and toggle Airplane Mode on.
Turn off Location Services: Turn off location services completely, and you'll save a lot of power, not to mention some money if you’re 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 you’re 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 or our previous post.)