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Here are the main reasons, in no particular order:
1. Push Mail
When your mail is set to push, it means that every second, your iPhone is connecting to the server and asking, “Is there mail? Is there mail? Is there mail? Is there mail? etc…” This constant flow of data drains your battery very quickly, and it makes sense if you think about it. The problem seems to be compounded for those of us who have Exchange servers set up on our phones.
The fix: Go to Settings -> Mail, Contacts, Calendars -> Fetch New Data -> and turn off Push. Scroll down to change Fetch to Every 15 Minutes and set each individual account to Fetch. The Mail app will still check for new mail every time it’s opened and send your messages right away.
2. Location Services
Like I said, I’m all about using your phone. But there are a few services that you probably don’t know about that can constantly drain your battery. Go to Privacy -> Location Services -> and scroll all the way down to the last item, System Services. Tap on System Services to open that folder. Here’s what I suggest: Turn off Setting Time Zone if you don’t do a lot of travel, turn off Location-based iAds if you find Apple’s tracking your location to deliver you personalized ad content unnecessary, and turn off Diagnostics and Usage if you don’t think Apple needs to know exactly how you use your phone.
New in iOS 7 (and this is important), tap Frequent Locations at the bottom of the list. Yes, your phone has been tracking you everywhere you go. I personally don’t see a need for this feature and it uses a lot of battery because it is always tracking your whereabouts, so I’d suggest you turn it off.
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