Finally I found out the reason of increase in my battery consumption. It's because of 4.3.2. I saw also many people on web writing about the same issue.
Once having upgraded the ios in my ipad2 to 4.3.2, battery consumption increased about 30%.
What do you suggest guys? Can I go back to 4.3.1? Is there any way to do that? Or shoulld wait for apple to solve this?