HT1688 iphone 4 battery draining out

I believe there were a lot of people who were having issues with battery draining quickly after the iOS 6 upgrade. The latest patch release from Apple was suppose to fix the issue, but for me the issue has become worse. It drains out to almost 74% in 1/2 hr phone call and upto 40% in 2-3 hours with nothing else.
Has anybody else have similar experience? Is Apple releasing another patch soon? I use this phone for my office calls and mails, and constant need to keep it charging is hurting my mobility.

http://www.apple.com/batteries/iphone.html

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    http://www.overthought.org/blog/2014/the-ultimate-guide-to-solving-ios-battery-d rain
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