How to save battery life on iphone

Steps

1. 
   1
   Lower the brightness. Go to the Settings menu, select the Brightness option, and turn the screen brightness down to low. It will be somewhat more difficult to use apps or read something on low brightness, but it will save you lots of battery power.
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2. 2
   Update to the latest software. Apple engineers implement frequent changes to iPhone software, making it necessary to update to the latest software in order to harness those changes.
   • If your phone is operating iOS 5 or later, check for software update availability by going to Settings → General → Software Update.
     
   • To check for software update availability through iTunes, plug your iPhone into your computer and look for it in the source list. Click on the iPhone in the source list and then click on “Check for Updates.”
     
3. 
   3
   Use music, videos, games or internet browsing sparingly. The graphics in these can all quickly drain your battery life, so make sure you're using them for all they're worth.
4. 4
   Fetch data manually, or set fetch data to "hourly." Your phone fetches data periodically to update email and other notifications. The more often your phone fetches data, the quicker your battery life may deplete.
   • To tell iPhone to let you fetch data manually, navigate to Settings → Mail, Contacts, Calendars → Fetch New Data → Manually.
     
   • To tell iPhone to let you fetch data by the hour, navigate to Settings → Mail, Contacts, Calendars → Fetch New Data → Hourly.
     
5. 
   5
   Turn WiFi Off.
6. 6
   Turn Cellular Data and (especially) 3G off.
   • Go to Setting → General → Cellular → Switch Cellular Data and Enable 3Gto Off.
     
7. 7
   Turn off push mail when you're not using it. If you have push mail on for a Yahoo! account, for example, and you dearly need to save power, turn off mail. To turn off push mail:
   • Navigate to Settings → Mail, Contacts, Calendars → Fetch New Data, and set Push to Off.
     
8. 
   8
   Turn off push notifications. The iPhone's various apps are sometimes alerted to software updates through push notifications, which can unfortunately drain battery life. In order to turn off push notifications, navigate to Settings → Notifications and disable notifications for any applications you don't deem absolutely necessary.
9. 9
   Use location software sparingly. Some apps on your phone, such as Maps, use location-pinning software to determine GPS locations. When you are not using them, and for privacy concerns, get in the habit of turning this function off.
   • Go to Settings → Privacy → Location Services and disable.
     
10. 
    10
    When no coverage exists, switch to airplane mode. Your iPhone always tries to search for coverage, even in places where no coverage exists, burning battery power as it does so. For this reason, it's recommended to switch over to airplane mode when you are in such an area.
11. 
    11
    Close apps properly. If you just press the Home button, some apps are still running in background. Double press the Home button and close them manually.
12. 12
    Give it space when it charges. You may notice that your iPhone gets warm when it charges. If your iPhone is wrapped up in a carrying case while charging, the excess heat may affect the battery power. Be sure to give your iPhone adequate space while it's charging.
13. 
    13
    Lock your phone (or put it on a short auto-lock). If your phone isn't set to a quick auto-lock time already, be sure to correct it. There's a good chance that your phone could waste battery power when you aren't using it if it isn't locked.
    • Go to Settings → General → Auto-Lock and set it to 1 minute or less.
14. 
    14
    Let your phone complete at least one charge cycle each month. A charge cycle is when you charge the phone to 100% and let the battery power drain completely, after which you charge it again. Going through a charge cycle per month keeps the electrons in the iPhone lithium battery properly greased, so to speak.
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Battery saving tips for your iPhone

Tips

• Don't keep checking the time and battery life. It just uses more power!
• Visit an Apple Store near you or any electrical shop - you can plug your iPhone into one of their docks to give it a boost charge.
• Always charge your device before leaving home, especially on long trips. Bring the charger with you if you are going away overnight, or for an extended period of time. Did you know you could also buy iPhone car chargers? That's even more helpful.
• Turn your iPhone off overnight and use a proper alarm clock.
• Switch to airplane mode.
• Get a power bank.It can charge your iPhone or any device a few times. Make sure both your power bank and iPhone is charge before leaving for long trips. Recharge when ever you have the opportunity.
• If you don't have a battery charger with you, another option is to plug the device into a computer or laptop with an Apple USB cable, open iTunes, and let it charge.