1.1.3 decreases battery life?!?

I've only had my iPhone for a few weeks but I had an odd experience with the battery following the upgrade. I left work at 5PM with 50% battery. At 7:30 I went to use my phone and it gave me a 10% battery life warning. Seemed odd to my. I know that before last weeks upgrade the battery would last for about 14 hours.
 
I've noticed that my battery has reduced performance by 10-15% after upgrading to 1.1.3. I wonder why.
 
yeah, ive noticed mine is lower, but i just figure that with all of the added features and stuff maybe it saps a little more. hopefully theyll iron it out. it hasnt been a huge difference, and my batterys never died (except when im reckless with chargin it)
 
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