App running the battery down?

The battery in my iPhone has started running down pretty rapidly in the last few days.  It could be the battery itself, of course, but I am wondering whether there is an app running in the background that is consuming a lot of battery power.  Could this be the case?  I know how to press the Home button twice to see the apps that are in the background.  But is there a way to find out which of the apps might be consuming a lot of battery power?  Thx

I too have this exact problem - and I think it was occuring before I updated to 4.2.3.  Today I started with 100% power. It has been on charge via USB all day, but in the hour it took to get home, it reduced to 10%.
Add to this, a lot of my apps are crashing - just shutting down half way through.
- Facebook - just shuts down
- SMS message - variably shuts down half way through messages.
- Email - one of my accounts works, the other (work) stopped working on the 21/4.  When I go to Settings>Mail, Contacts, Calendars> and select the account, it just hangs, before shutting down back to the main screen after a couple of minutes. 
In essence, my Iphone is completely screwed at this point in time. 
I have done what was suggested about (Sleep + Home buttons) but no difference to the Email function (I can't disable it - it wont get in that far).
BTW - it's a 3GS, and not Jailbroken.

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    Con't
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