Battery life gone after "upgrading" to 4.3 (iPhone 3GS)

I've lost all battery life after upgrading last night to ios 4.3! I barely get 5-6 hours, whereas I always got a full day (probably two if i let it run down) before the upgrade. I can't believe this is a coincidence. How do I go back to 4.2? Or is there a cure for this?

OK, problem solved, with the help of Apple Support.
They suggested that I re-install the upgrade using Restore on iTunes. So I backed-up the iPhone, did a Restore to factory settings, and then restored all the apps, music etc from the back-up. The phone was fully charged 8 hours ago now, and has gone down to 80% with some occasional use .... this is typical for my 3GS. So: "Restore to Factory Settings" worked. Don't ask me why!

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