IOS 5.0.1 increased battery life from 2 days to 3

I installed the new software on Friday night from a wired connection to the computer. The download and install took around 15 minutes. before the install I could go two days with out a charge. My phone was fully charged on Friday night at 10:00pm. Today is Monday at 8:41am and I still have 50% battery left. I have sent hundredes of text messages, stream hours of pandora, and watch multiple you tube videos. The only two things that I monitor are Wi-Fi when I'm away from home and closing apps. I also always drain my battery life to 1% before charging. If any one wants my setting to try just let me know.

After two days trying out the problem with my iPhone 4s battery - I had "reset all setting", set up WiFi again and disable all location completely, change the notification list. My Gmail account setting to push to off and manually get the emails. iCloud switch tooff.
I had drain the battery completely until iPhone is dead as requested - I had it off for about ten minutes before re charge fully for overnight. I noticed battery had drain rapidly during day if I use messages and emails.
The next day I had re-charged fully to 100%, then plugged it out and I had left it on stand by before I go bed. The following morning I noticed iphone 4S battery down to 84% the same.
It hadn’t makes any differences or am I missing something…

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