After update to IOS4.2.1 my 3Gs battery % keep dropping

after update to IOS 4.2.1, my iphone 3Gs battery % just keep dropping, without using whole night, the battery % drop from 100% to 75%. I never meet this problem when i was using IOS 4.1, Anyone know whats the problem?

I've noticed similar problem recently, not 100% sure if it was after updating to iOS 4.2 but I would go from 100% charged before I sleep to 80% when I wake up 5-6 hrs later.
I've noticed when I look up the usage in settings, the usage time is exactly the same as the standby time, which I can't seem to explain even though I'm not even doing anything with it.
It's got to the point where I have to charge it daily, when before it could've lasted 2-3 days if I didn't use it.
PS. I do not use it for any email/web surfing. It is primarily for the iPod and maybe 5 mins of Angry Birds =\
Message was edited by: Nagisama

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