Why my iphone battery discharges so quickly

I have two iphones 4 and 4s, battery in iphone 4 lasts much much longer than the  4s what can I do to solve the problem? or is it faulty? my first one was faulty and apple gave me a new one.

After searching at website. It works for me about battery issue.
1. Go to Settiings / General / Siri / turn off Raise to speak and then reboot.
(A sensor upper the earphone is continuing on even if you turn it off, YOU MUST REBOOT YOUR IPHONE.)
I think that it is the major problem about battery drain.
2. Go to Settings / Location Services / System Services / Turn off Setting Time Zone
3. Go to Settings / Notifications / Turn off Calendar or move to Not in Notification Center
(this may be not need but I don't use this function, so I turn it off.)
After a fully charge, Usage 1 hour and Standby 3 Hours, 14 Minutes, Battery less 8% only. Now is 92%
My idea, try to reset all settings first, I like a clean reset all settings and then do 1,2,3.

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