Thank you all..
Now i am ok with the battery because i switched off everything even wifi and data plan and every app...to test...and now the battery lasts for almost 1 full day..
But what about the data plan issue i talked about?
why my data plan is being used vigourously? and it's almost 65% used with in a week of purchase? any suggestions on that? i don't have any special apps...so what do you think which apps or whatever are using my data plan and how to stop this and use the app at the same time?