How often do you get to the end of the workday with more work than battery life? I went on a Google quest to find tips to improve the battery life on my iPhone and found several great articles from lifehacker.com. Below is a trick from each article. Click the links to read the full articles.
“Today's laptops use Lithium batteries instead of nickel, but there's a lot of incorrect information out there about how to charge or drain your batteries, so let's set the record straight: Nickel batteries required being fully drained before a recharge to optimize your battery life, but Lithium batteries are the opposite—you do not need to fully discharge it before recharging, and in fact, if you fully deplete a lithium battery and don't recharge for a while, it can become incapable of holding a charge.”
“Clear the multitasking queue so you don't have an endless trail of open apps. Even though Apple designed multitasking to be battery-friendly, suspending a ton of apps still takes its toll. It can be frustrating to manually close a bunch of apps in the multitasking queue, but doing this on a weekly basis can help reduce unwanted battery drain.”
Access the multitasking queue by double tapping the home button, press and holding any app in the queue, and then tap the “-“in the corner of the app.
“Your screen, especially if it's one of the new beautiful Super AMOLED or Super LCD displays, draws by far the most battery from your device. The best way to minimize your screen's battery usage is to turn the brightness down. By default, your phone should be on "Auto" brightness, which works, but might still use up more juice than you'd like.
If you head to Settings > Display > Brightness, you can uncheck "Automatic Brightness" and put it on something like 10%. It'll be a little harder to see in direct sunlight, but you'll be better off everywhere else. Putting the Power Control widget on your home screen makes toggling between low and high brightness a lot easier, too, so that's a widget I highly recommend you use if you don't already. To add it, press and hold on an empty section of your screen, choose Widgets, and pick the Power Control option.”