IOS 6.1.2 for iPhone 4s draining battery?

I downloaded iOS 6.1.2 for my iPhone 4s a few days ago when my phone told me it was time to update. Now all I get is 17 minutes of usage and 6 hours of standby when I used to get at least 18 hours of standby and 6 hours of usage before my phone needed a charge. This is very frustrating. My phone is 8 months old. I don't use mail on it. I've seen some people have problems with mail being the reason why their battery drains. I lock my phone when I'm done using it, I have the brightness down, I go through and delete background activity every couple days. This shouldn't be happening. Does anyone else have this problem and has anything fixed it?

Follow this link:
http://appldnld.apple.com/iOS6.1/091-0926.20130215.DaTe4/iPhone4,1_6.1.2_10B146_ Restore.ipsw

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