Serious battery drain on iPhone 4S

Dear experts
I have a serious problem with iPhone 4S. I am on 7.0.4. My battery drains in front of my eyes...1-2%/min!!! I could barely use my phone for 1 hour or so. Sometimes I also noticed that battery reading is total chaos....it jumped down from 65% to 27% in a min. Yes within a minute! This is insane....further I tried everything based on available information. Started with setting the new iPhone....turning off unwanted stuff...background app refresh...battery calibration...every possible trick in the book. No use!! Is this a software bug or I need to replace my battery? I only remember that on iOS 6, my iphone was running well n good....Please HELP.

Update: I figured out that it was not a software bug, but a hardware. The battery for some reason looked like a chocolate bar...rough surface and soft in few areas against a flat surface feel of new battery. Of course I changed the battery and now phone is back to normal. Do not know why the battery is physically damaged. But replacing it solved my battery drain problem.

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    Sorry for the MANY mistakes, my English is not good =\.
    Cheers from Brazil!

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    Hi Folks,
    iPhone & iPad2 battery drain issue SOLVED!!!!!
    I had a serious battery drain problem on THREE devices using different iOS .... it was a simple fix and had certain characteristics that you may be able to relate to ......
    Devices;     16GB iPhone 4 with IOS6
                      16GB iPhone 4S with iOS7.06
                      32G iPad2 with iOS7.04
    On or about Feb. 28th all three devices started to drain the battery like crazy losing about 20%/hour on the iPhones and 10%/hour on the iPad2 .... After messing around with settings, browsing forums and looking at what was common between the three devices I concluded the problem was with a single Microsoft Outlook/Live/Hotmail email account in the iOS native mail app .... I deleted the email account on all three devices (along with other unrelated Microsoft accounts on each device) and did a hard reboot (hold HOME and top LOCK button simultaniously for about 10 seconds until the apple logo appeared).
    I then re-created the common Microsoft Outlook/Live/Hotmail account on all three devices in the iOS native mail app ...... SUCCESS! Now all three devices are behaving normaly with respect to battery drain ......
    Hopefully this will be useful to others in this thread ..........

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