After IOS 5.0.1 upgrade - Battery drain from 100% down to 78% the following day

I had charged my iphone 4S battery to 100% and my ipad battery to 100% also: both upgrade to 5.0.1, I had 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 78% and my ipad battery down to 99%. Surprised with iPhone 4S battery drain so quickly and where is coming from? I had to re-charged it again thro car charger. Happy with iPad 2 battery.
On iPhone 4S I had turned off all notifications accept Messages, EirText Pro, WhatsApp and Tango . The Location Services is switch to off competely. I have gmail account setting to push to off and manually get the emails. iCloud switch to off.
Is there any advised on the battery issue or is Apple to issue another upgrade 5.0.2 to solved the battery on iPhone 4S?

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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After IOS 5.0.1 upgrade - Battery drain from 100% down to 78% the following day

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