Source: HuffingtonPost The 9 Biggest Tech Myths You Hear All The Time (But Are Absolutely Untrue)
Except, here's the thing: Those apps you see when you press the home button twice aren't actually running or using up any battery. As Fraser Speirs pointed out earlier this year, that row of icons is a list of recently used apps, NOT currently-running apps; when you hit the home button and exit an app, the iPhone automatically shuts it down after five seconds or so. Except in special cases (listed on Speirs' site), the app is not running nor eating up battery life.
Closing out apps might be dang satisfying -- it's like playing whack-a-mole! -- but it is almost certainly not preserving battery life."
But here is a BIG tip for making your iPhone battery life longer:
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