OS 5 is the origin of battery problem not iPhone 4S

The new version of OS 5.0.1 decrease in a very important way the duration of my battery of my iPhone 4. The problem comes from the OS 5 not iPhone 4S. Are you all right?

The vast majority of apps cannot and do not run in the background.  For more info on Multitasking...
http://support.apple.com/kb/ht4211
http://whenwillapple.com/blog/2010/04/19/iphone-os-4-multitasking-explained-agai n/
http://www.macworld.com/article/1164616/how_ios_multitasking_really_works.html
http://speirs.org/blog/2012/1/2/misconceptions-about-ios-multitasking.html

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