The iPhone can do many things, especially with the right apps installed, but it's useless to you if the battery only lasts a few hours before it dies completely. Because there are many different causes of increased battery drain, figuring out where the issue lies for a particular iPhone may not be easy, and can require extensive testing.
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Applications and services that constantly check the iPhone's location using Location Services can increase the drain on your battery. Open the settings, tap "Privacy" and tap "Location Services." Disable location services altogether or, alternatively, selectively disable the entries that correspond to apps you don't use. If you find yourself needing to use an app that requires location services to function, you can simply switch them on temporarily, then switch them back off once you are done.
The brighter your iPhone's screen is, the more battery power it consumes. The iPhone has an ambient light sensor that can detect light levels and automatically adjust the screen's brightness up or down. Open the settings, tap "Brightness & Wallpaper" and set the "Auto-brightness" option to "On." Alternatively, drag the slider to the left to reduce the screen's brightness. If you are ever in a situation where the screen is too dim for you to read comfortably, simply increase the brightness temporarily.
Notifications and push
Frequent notifications and instant e-mail fetching can help you keep on top of things, but can also significantly increase the iPhone's data consumption. Open the settings, tap "Notifications" and disable unimportant notifications. Return to the main settings screen, tap "Mail, Contacts, Calendars," tap "Fetch New Data" and switch "Push" off. Change the "Fetch" setting to the interval you find most appropriate, or set it to "Manually" to only check your email inbox for new messages when you open the email application.
The Carat app, developed by a team at the University of California, Berkeley, in collaboration with the University of Helsinki, gathers information on how you use your iPhone and sends it to a central server. There, the data is analysed to determine what actions you can take to improve your iPhone's battery life. After you download and install the app, open it every few days to allow it to transmit the data; after approximately a week, you will start receiving personalised reports.
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