How can I close apps on my iPhone 4s that are draining my battery?

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close apps on my iphone 4s it is draining battery

I need to close open apps draining my battery on my iphone s4

 

[kch50428]

Re: close apps on my iphone 4s it is draining battery

Start here: http://help.apple.com/iphone/9/#/iphca3d8b4e3